Sizing & Cutting an Integrated Seat Mast | Tech Tuesday

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In this Tech Tuesday, Calvin adjusts a bike's saddle height. That's it. That's the video.
Well, it is a little more involved than usual - this saddle is on top of an integrated seat mast on a carbon fiber tri-bike frame. We'll talk about what makes this system different from a traditional seat post system, and walk through the procedure for measuring, cutting the seat post, and installing the saddle.
Questions or comments? Leave them below!
➤ Tools & materials used:
• RR-12 Tape Measure - www.parktool.c...
• DC-1 Digital Caliper - www.parktool.c...
• SAW-1 Hacksaw - www.parktool.c...
• CSB-1 Carbon Cutting Saw Blade - www.parktool.c...
• SG-7.2 Oversized Adjustable Saw Guide - www.parktool.c...
• ATD-1.2 Adjustable Torque Driver - www.parktool.c...
➤ Fix It:
Did you know that Park Tool is the #1 resource for bicycle repair education?
• Visit our RU-vid Channel: / parktool
• Visit the Repair Help section of Parktool.com: www.parktool.c...
• Check out The Big Blue Book of Bicycle Repair: www.parktool.c...
➤ About Park Tool:
Since our founding in 1963, Park Tool has been the leading name in bicycle tools. Our RU-vid channel is an extension of our mission to be the ultimate resource for mechanics and riders of all skill levels. Here you will find comprehensive repair help tutorials for a wide range of components and processes, as well as troubleshooting guides, tips and tricks, and information on the latest Park Tool products.
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Опубликовано:

20 сен 2024

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Комментарии : 153

@masonrose-hamby2798 5 лет назад

I may never have to use this video for a tutorial, but the videos are so dang entertaining and I can’t stop watching them

@wasabij9496 3 года назад

Me to i am a mtb rider i don't know why i watched this

@backpacker3421 4 года назад

Thank you for putting up the eye protection reminder at the end. Also, even when you're spraying the soapy water, it doesn't hurt to wear a filter mask to protect your lungs from any particles that might still escape into the air.

@richardhaselwood9478 4 года назад

I absolutely love the positive dust suppression, removing the hazard (because carbon fibre dust is really nasty), instead of relying on a mask, and sending up a dust cloud around the workshop.

@hansschotterradler3772 5 лет назад

Nice work stand. The bike industry has the tendency of inventing stuff to make our lives more difficult. I dig my threaded BB and 27.2 seat post.

@Heleninhalinda176 4 года назад

Threaded BBs are coming back, because they're really superior

@aidanf2610 4 года назад

Gabriel Miquéias they’re not really superior, just do a better job of masking the manufacturing errors that most big brands make

@Heleninhalinda176 4 года назад

Exactly, like oval BB shells (cannondale!!!)

@bikedawg 8 месяцев назад

Calvin is the BEST----thank you so much!!!!!!!!!!!!! ❤ 🧡 💛 💚 💙 💜

@vpatsikas 4 года назад

Fantastic work! Very detailed and shows how needs to be done properly step by step!

@nedt 5 лет назад

Wow, just wow. One take! (Up to the cut)Anyone else want to risk their multiple thousand dollar bike in one take? @parktool well done!

@fpp666 5 лет назад

Damn, Calvin wasn't kidding when he said he was going to use a hacksaw on a carbon fiber bike! I was waiting for him to stop and show one of the cool tools he always has :-D

@backpacker3421 4 года назад

The blade is the cool tool. It's specially made for carbon fiber cutting.

@gonetoearth007 5 лет назад

nice video Calvin...the soapy water and tape tips are great given the amount of times I have cut seat posts and steerer tubes! thanks for all the help over the years!

@gonetoearth007 4 года назад

@Tom Anderson totally agree! I use mask and eye protection on all my builds.

@jermstaallen4913 3 месяца назад

You make it look so easy, I need to do mine but I don’t have one of those fancy guides and I’m not 100% sure my old bike is set up good enough to measure off 😬

@redtobertshateshandles 4 года назад

Park tools are affordable and good quality. Thanks.

@tenpirpa4503 3 года назад

Not sure about the affordability part but definitely top quality

@natenorthway6488 5 лет назад

A lot of people are criticizing Giant's design here, but keep in mind that this is a carbon bike with Di2. Probably a racer. The weight savings is probably pretty significant. Also, Calvin, wear PPE whenever using a cutting tool!

@backpacker3421 4 года назад

I was cringing through the whole thing - no glasses, no mask. Soapy water only goes so far...

@adolforodas7150 10 месяцев назад

Thanks, I really need it, this guidance help me and now I know how to do it

@zygmuntthecacaokakistocrat6589 5 лет назад

I use an HEPA vacuum cleaner with a nozzle nearby to catch the dust.

@backpacker3421 4 года назад

That's good, but you should also consider a mask. There is no other way to prevent breathing the particles. Soapy water can prevent most of them. A HEPA vacuum can get most of them. A filter mask will stop the rest.

@jerrygundecker743 5 лет назад

If Norm Abram, (New Yankee Workshop), had worked on Bikes instead of solid wood, he would have done it this way. Well done.

@backpacker3421 4 года назад

When Calvin taped it, I was absolutely thinking about woodworking. Great way to reduce blown out fibers for a clean cut.

@cwsmith17 5 лет назад

Great stuff. Park Tool rocks

@ericpatterson8596 5 лет назад

Great job park tools

@manuelmalagon210 3 года назад

This guy is amazing!

@Texmotodad 5 лет назад

Nicely done sir!

@leroyyoder3494 5 лет назад

I love the way Calvin is always thinking about the ergonomic aspect of working on bikes. Home mechanics may have a harder time without the high tech bike station.

@backpacker3421 4 года назад

I don't know, my stand will rotate, and the height is adjustable. Raising and lowering the bike takes a bit more elbow grease than just pushing a button, but it can be done.

@daniellinden2880 4 года назад

Thank you very much for the video. Very instructive. But I have a question: What can we do if the cutting be more than necessary or if you find a second hand frame with that problem?

@davidurciuoli8594 2 года назад

My seat is a little too high for 20 yrs it was fine. Not sure if it is an aging thing. I tried to lower my seat when removing the mast and saddle I was shocked to see a cut going around the carbon seat post. I have the shortest mast presently, so hopefully a 1/2 cut will do it. Of course bike shops say buy a new bike.

@dimi3585 2 года назад

I have the same.. But normal because the joints between ankles, knees and hip become thinner about half a cm.. Times 3

@koukimonzta 5 лет назад

should have shown us how you measure the rider height against the ISP prior to cutting.

@paisfr 5 лет назад

Moi j'adore , merci à la prochaine . Thank you . ) 👍

@12Okmtonl Год назад

I was wondering if I could run the seat mask without shims? Will it damage the seat mask?

@parktool Год назад

Always check with the manufacturer

@oreocarlton3343 5 лет назад

Such a total overdesign of a seatpost

@ed0078 5 лет назад

Like the stand

@greenpedal370 5 лет назад

The funniest thing about these comments are the hysterical remarks regarding insignificant quantities of carbon dust.

@stellarpod 5 лет назад

Perhaps you should discuss these "insignificant quantities" of carbon dust with someone who actually knows what carbon can (and will) do from a corrosive standpoint to some metals. This dust will fall down into the bottom bracket area, which could cause issues at some point, where your crank spindle and bearings live. Why on earth wouldn't you take the time to remove it to avert that possibility?

@backpacker3421 4 года назад

It does not take much carbon dust to cause serious health problems if you breath it in. If you cut carbon once every few years, you'd probably be fine. If you work on carbon bikes for a living, and don't take precautions, you will probably die an early death of major respiratory problems. "Insignificant" does not belong in any sentence describing a potentially fatal health hazard.

@greenpedal370 4 года назад

Good grief we are talking someone cutting a seat post, not industrial applications. Like I said Hysterical.

@backpacker3421 4 года назад

@@greenpedal370 Professional do this a LOT, mostly on steerer tubes and handlebars. If you want to expose your lungs to a carcinogen, that is your right, but encouraging other to do the same, or criticizing those who are encouraging good safety practice, is negligent and foolish.

@greenpedal370 4 года назад

@@backpacker3421 Oh please.

@BashirAhmad-fy6tw Год назад

What's the battery thing that was pushed down? What is it used for?

@parktool Год назад

That is to power the Di2 shifting system on the bike.

@Robin_S78 4 года назад

I’ll get the Propel Advanced SL in a week. Hope the Giant store works at the same level as you do! How many mm spacers can you use maximum? Just in case I need to higher the seat when I change crank length....

@christianuribe5612 3 года назад

Where to do you get the spacers ? Bought one n need the post higher

@actonblue2012 4 года назад

Do you have to be careful when clamping the seat mast, would the sawing have any adverse effects on the clamped section?

@parktool 4 года назад

Manufacturers that use seat masts put thought into the bike being clamped and build it to be able to be clamped. Sawing is intended my the manufacturers and the only ill effect would be if you cut too much off. Which leads you to plan b which is typically a conversion post.

@blarpieman 3 года назад

any particular blade you like to use? Doing this later.

@parktool 3 года назад

For carbon, 32tpi.

@blarpieman 3 года назад

@@parktool Thank you so much. That blade looked completely different than a 32tpi blade was that carbon specific? Sorry to ask.

@cuantekusa6809 3 года назад

I have a 2014 TCR Advanced SL 0 with the same kind of seat post clamp in this viseo. I am using two spacers on top of the actual fiber carbon seatpost (part of the frame) then the clamp with the saddle. The problem I am having is a crazy creaking coming from the seatpost/clamp. I tried already using grease, carbon grease, even putting electrical tape around the carbon seatpost. Any suggestions on how to get rid of the creaking noise? Thanks in advance.

@parktool 3 года назад

Are you sure it is not the saddle/ rails and where they attach? These seatmast caps are not necessarily known to creak but the clamp for the rails is. Remove that, clean, grease threads and re install.

@iamcyberpunk68 Год назад

Mainly when putting things together

@stellarpod 5 лет назад

At about 9:43 you can clearly see a substantial pile of carbon fiber filings inside the tube, above the Di2 unit, which should have been cleaned out before righting the bicycle and attaching the seat. Details matter, sir. Steve

@parktool 5 лет назад

Thanks for your concern Steve.

@LukeThomasPerth Год назад

Can i use a powered circular saw for this?

@twoweeledsoto6072 4 года назад

Ooops! I thought,,,,,,, Nope! I'm in no hurry for this. I'm pretty sure the weight loss isn't worth it, to me. Video is excellent, but this is just too much of a pain for the return. Oh yeah, and let's acquire some more tools that I can toss with the next change.

@valtersh4968 4 года назад

But what happens if you buy this bike you have to get the seat post for your hight but you grow higher then what happens?

@benjaminsamani8689 2 года назад

What’s the product name of the integrated seat mast clamp?

@pbenjlo 3 года назад

Oh my god, I almost cried when he lowered the bike stand electronicaly. I was expecting a crushing sound :|

@johnraymondsantos6169 Год назад

Is it okay or safe to put the seat mast on the maximum limit insertion cap? My bike is emonda, thanks

@parktool Год назад

As long as you do not go past the line you are good to go.

@mancello 5 лет назад

Thought you weren't supposed to clamp down on carbon like you're doing with the workstand clamp on the seatmast.

@parktool 5 лет назад

If you're careful, you can clamp on almost anything. See this video for more of our thoughts on the matter: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ix_e6LWvap0.html

@zygmuntthecacaokakistocrat6589 5 лет назад

The front and back of seat masts are stiff and strong compared to the sides, which is where Calvin has clamped it.

@backpacker3421 4 года назад

@@zygmuntthecacaokakistocrat6589 Yes. Anybody wondering why can take a look at the cross section of the mast during the cutting. Very thick front and back, not so much on the sides.

@dickieblench5001 Год назад

What if you need an extra 1mm

@kerianhalcon3557 3 года назад

Ohhhh, Metric, always love Calvin using Metric, American must be losing it watching this!

@christianuribe5612 3 года назад

So what to do if you HAVE to make higher .. can I stack or do I have to replace the post

@parktool 3 года назад

There is some adjustability in the height of the mast cap. If you really need to make it higher than possible some companies give you the option to put a standard post in. But this is not common and cutting too short is a very bad thing.

@ekocahyono8058 2 года назад

@@parktool how higher i can adjust the mast cap? What if i cut to low 2-3cm?

@JIMWSMITH 4 года назад

Great thought by giant marketing. Hmmmm one bike fits possibly one person = more sales = kills the secondhand market 🤔

@michielnooren2076 5 лет назад

1:38 Loan it to a friend? 🤣 Calvin you must be joking! Are you on drugs?

@GerryWilton76 5 лет назад

Great video... sure seems like a bad design that unnecessarily limits the bike's sizing.

@greenpedal370 5 лет назад

It's an engineers delight.

@backpacker3421 4 года назад

It's a design feature intended for a more bespoke use. One rider wanting to shed every single ounce to go as fast as possible. Not really practical for typical consumer use, but very very practical for those riding competitively.

@guntherschultz912 4 года назад

doesn't carbon arbsorved water?

@parktool 4 года назад

No, it does not absorb water, or even grease/oil. Chemically, carbon fiber is very inert. This is one reason some sailboats and windmills are made from carbon fiber.

@BodyKnight 2 года назад

Yhea, you really don't want to use the caliper to scribe on stuff. Calibers precision comes from how sharp their blades at the tips are.

@seniorbrusko 3 года назад

How to know if you cut it too short? is there like a danger area for these types of seatpost? I have an emonda SL5 and I need to cut it :(

@adriangandara4715 5 лет назад

What kinda soap? Dish? Does it matter? Thanks.

@johnsmith1474 5 лет назад

Are your joking? Just use a vacuum.

@adriangandara4715 5 лет назад

@@johnsmith1474 no I wasn't joking. I guess I'm not as smart as you.

@parktool 5 лет назад

Any kind is fine. Just plain water works better than nothing as well. A vacuum would usually do the trick but most people don't have the extra hands or a fixture to go that route.

@johnsmith1474 5 лет назад

@@adriangandara4715 - You may have an IQ of 250, but you do lack some basic understanding of things. He was using the soapy water to prevent flying dust, which was in small volume as it's not a power tool process. The use of soap is weird and useless water is a lame solution to begin with, unless you are cutting masonry or some other very dirty materials with power tools blowing it everywhere, or wish to collect every bit of dust waste for reuse later. I don't like putting water near batteries (the object inside the seat tube is a battery), and the muck he creates just sits there and needs to be cleaned out anyway. So I suggest a vacuum held near the sawing action, quick neat easy done. This is standard procedure in the trades where you make dust. I love this guy, but as you can see when he refers to the "Doppler effect" he does have his limits of knowledge/understanding as do we all.

@adriangandara4715 5 лет назад

@@johnsmith1474 I ask questions about things when I want to understand them better. I've only cut a carbon steer tube and didn't use anything but a hacksaw and a vise. I asked because I know some soaps have chemicals in them. I wasn't sure if that could damage the paint or clear coat. I don't like people who make jokes or talk down to people who ask questions. Reminds me of kids who bully other kids in school, or make fun of them when they ask questions that they deem to be stupid. I know it's the internet so people feel entitled to say what they want because they're no repercussions. My name is on my account and my face is my avatar because I conduct myself online as I would in real life, like a man. It seems to me you should make your own videos since you know better than most. Then you could save your breath and wouldn't have to make quips or judge others who are actually helping people who know less than them. You also have no idea what I lack or have in abundance. If you're ever close to El Paso, TX I would love to show you.

@richcole3931 5 лет назад

no mask?

@johnsmith1474 5 лет назад

Please. Find a safe place.

@CyclingSteve 5 лет назад

Soapy water...

@backpacker3421 4 года назад

@@CyclingSteve The soapy water doesn't get it all. It helps, but a mask is still a good idea. You know, if you do this on a regular basis (professionals) and want to keep breathing well into old age. If those things don't apply to you, then a mask is not really necessary.

@backpacker3421 4 года назад

@@johnsmith1474 I'm sorry, did Rich's concern for proper safety trigger you?

@mattgies 5 лет назад

Good video, but I would have liked for you to mention the reason it's important to keep the carbon fiber dust out of the air: It's carcinogenic.

@backpacker3421 4 года назад

Which is why using soapy water AND a mask is a very good idea. Soapy water prevents most dust from reaching the air, but not all.

@devilriderdiyush4424 5 лет назад

Can you guys sell your company products to Nepal please here is not available tools to make my cycle run please reply

@parktool 5 лет назад

Shops and customers looking for our products in Nepal should contact our distributor in India. HAPPY EARTH ENTERPRISES LLP

@TuanPham-rh3ee 4 года назад

Can you cut a carbon fiber post?

@parktool 4 года назад

Yes, certainly. Measure a couple of times first. Finish the end with sandpaper.

@hellojrod 5 лет назад

26 for MTB life. Old school 27 1/2 inch rims for road.

@fastbicyclerider7300 5 лет назад

I just losen the bolt and remove it and ride my bike til it loose

@xuannhapham9964 5 лет назад

Xe đẹp .

@garylucas7050 4 года назад

What happens when your mate gives you the bike back and you want to return it to its original height 🤷🏻‍♂️😉

@parktool 4 года назад

Dont lend you seat mast equipped bike to your buddy ;)

@garylucas7050 4 года назад

Park Tool exactly right

@brentnearhood8874 5 лет назад

Do I need to seal the cut carbon fiber with something?

@mrfailure93 5 лет назад

You could use clear nail polish if it made you feel better. I've never been told to need anything more than cleaning up the edges

@brentnearhood8874 5 лет назад

@@mrfailure93 Thanks!

@johnsmith1474 5 лет назад

@@mrfailure93 - Every guy has that around.

@mrfailure93 5 лет назад

@@johnsmith1474 Just like every video has a troll!

@johnsmith1474 5 лет назад

@@mrfailure93 - Nice to see you self identify.

@rjg3876 5 лет назад

Shouldn’t you have an respiratory device on when cutting carbon fiber?Remember your teaching people

@jamescarter67 5 лет назад

he showed in the video he wet it with like water to keep the carbon dust from flying every where

@johnsmith1474 5 лет назад

I suggest the use of a vacuum not water. But I must your generation is lost in fear. What the hell are you going to do to survive in a working world?

@rjg3876 5 лет назад

John Smith : I’m retired 50 years of the working world still have all limbs and in good health. Just trying to keep other from dying! By the way if do use a vacuum make sure it’s hepa filter if not your going breath in carbon fiber dust

@johnsmith1474 5 лет назад

@@rjg3876 - You could rent time with one of those boxes with remote arms they have for handling plutonium. You could just cut it outside. Or if you only do it rarely, you could ignore the issue because it's not an issue and no you don't need a HEPA filter for a little say action. You are doing nothing to "keep others from dying" you are bullshitting yourself.

@rjg3876 5 лет назад

John Smith : have fun with your potentially bad Heathy life. I made thru 35 year in the Elevator industry. could of been killed at any time had think all time. something I don’t think you can do

@davidbray8652 3 года назад

Adds about £300 for the bike manufacturer every time you need a replacement. Don't you just love modern engineers 🤬

@TERMINATORATL 2 месяца назад

worst design ever

@johnsmith1474 5 лет назад

You could use a Japanese saw, or razor saw. You need to have a vacuum in play, not soapy water (9:44 it looks like a pile of crap in there). It's silly to be shooting water into the frame. It's not the "Doppler effect" ha ha you are not moving at speed past the object emitting (sound) waves thus invoking a change in relative wavelength, it's just the change in resonance of the seat mast, as it is divided. When you dress it up, use a block. For someone actually doing this, consider they might not own an electric bike lift. You might have lectured on the option of making the cut with respect to adjustability (your idea of lending the bike) that is, cut it some measure shorter so that the user can both lift, or lower the seat a tad. As you cut it, it can now only be lifted, not lowered.

@iamcyberpunk68 Год назад

Fuck thats funny

@iamcyberpunk68 Год назад

I laugh at the way he talks every last word comes up in tone and volume . have a listen drama guy for sure