Thank you for such a detailed description! I go back to it every time I need to remove or install my bottom bracket. But it's only now that I notice you've flipped over the position of the sleeve )
Other (cheaper) tools are available for sure. It's often a good idea to pool funds with friends or local club members and collectively buy quality kit that will last for years for common jobs like this.
I never changed a bottom bracket and I was sure that It’s easy and I know how to do it. I was right, it is very easy, but it’s one of those videos that you are watching just to b sure that u r doing it correctly and I love them. This video showed EVERYTHING that u need to know and covered every little step that someone might just want to b sure about before he’s going to the next step even if he is 99% sure that he done that right. LOVE IT.
Super helpful video that covered everything you need to know. Thanks a lot. I took apart and serviced my BB using this video and others on youtube (Park tool, made to cycle and made good bikes). It went smoothly and was easier than I thought. Keep making videos they're very helpful for budding home mechanics!
Best video out there. Thanks for the great details. Decided to invest in a decent torque wrench for this. I wouldn't have thought of getting one that can measure torque counter clockwise without you mentioning it! It really helps you mentioning the tools in the description - e.g. the adapters for the BB tool.
So glad it helped out - my motto is that every day is a learning day :) Are there any other jobs or tech you'd like us to cover in the future? Ride safe!
still deciding whether I should replace my BB, doing overhaul on my 15 old bike (not many miles ridden, less than 1000 miles for sure) the old one still spins pretty smoothly, got a spare new BB-MT501 that should be a replacement for my old M542 crankset
When tf did they change the tool and why is it so hard to find the right tool without videos like this. I’ve been using Shimano bbs for years and now all of a sudden my bb wrench is useless so I have to wait 3 more days and pay more shipping to replace my seized BB. Nice one shimano
@@vanguardcycles ah well, I caved and bought an adapter, at least I have a spare bike for now, but I was planning to go for a ride tomorrow haha. First world problems
Can i ask, why is the outer shell on the BB-m800 smaller? I just got a neww BB for my bird aeris and it was one of these, so had to get a new tool to fit it.
The spacers remain a total mistery. Nowadays Shimano only mentions a QR code because they are "going green". However, I get completely lost on their website. So, with a 68 mm bracket, coming from a square crank set with a 50 mm line, what spacer should be mounted where?
I agree it can be a bit convoluted! If you go to si.shimano.com and enter the model of the part - in this case bb-mt501 - you can search for the "DM". The DM is the dealer manual, with all the installation info. For a 68mm BB shell (the bike frame) and a normal mounting front derailleur, it's 1x 2.5mm spacer on the left and 2x 2.5mm spacers on the right.
@@vanguardcycles Thank you sooo much!!! To be honest, I have been on that Shimano website with the QR code this morning when I started the struggle. But I get completely lost on their site, just like now when I tried it again. But, since you are so friendly to say where the spacers normally should go, I just do that. And you're right, I have the BB-MT501. Thanks again, you really helped me out! New subscriber here.
@@SgtJoeSmith They are interchangeable but you're right, they were switched. They didn't go in the bike like that, even though it shouldn't make any difference. Good spot!
What’s the purpose of the spacer? How do you know if one is required if you don’t have any paperwork on the crankset? I have grx cranks going into a Ritchey outback frame. Thanks. PS nice video.
The spacers are used to ensure correct fitting, chainline etc. Start by checking the width of your BB shell. Then go to si.shimano.com and search for the model no. of your crankset and open the DM (dealer manual). This should have the BB install instructions and confirm the exact spacer setup for your BB shell width.
Ah we've got videos showing both removal and installation of HTII cranks on the channel. Removal is here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-RrdviIDQLNE.html Assembly is here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Ql6aFcPiVDo.html Hope this helps!
That's a good point. Whilst things like factory-applied thread lock can help prevent corrosion, in real life a good coating of quality grease or anti-seize is much better. The cups are torqued so high in the frame that they are very unlikely to loosen. In addition, in British threaded (BSA) frames the thread direction coupled with the precession gives a "self-tightening" effect. The key is to prevent the cups seizing, especially if you have a steel frame.
I guess you mean it's a square taper BB? (rather than something like Octalink). Shimano make a 73x118 BB-UN300 which may well be OK, it will probably make very little (or no) difference to the chainline. If it's a case of installing that vs. writing off the bike, I'd go for it. Hope that helps?
This gives me the confidence to tackle it myself. One question: my crankset specs show two figures for bottom bracket shell width: 68mm and 73mm. Does this mean there's a range? I'm replacing an existing BB with the same one, so I'll replicate the two spacers already on there, but I'd like to understand the numbers. Thanks for this excellent guide to the process.
Really glad to have helped! You're quite right about the sizing. If you check the BB Dealer Manual, for example - si.shimano.com/en/pdfs/dm/MDFC001/DM-MDFC001.pdf - you'll see on page 11 the spacer setup is illustrated. Let me know if you need any more advice 😀
@@vanguardcycles So they're saying that BBs generally come in two widths, and they're giving you info for both. Now I understand why we should measure. Makes perfect sense! Thanks from Oakland, California, for your excellent video!
Yep that's right. Well, in fact cranksets and bottom brackets come in lots of different widths, so it's always best to measure. I'd also say if you're working on a used bike, it's always worth checking the setup with spacers etc, as they aren't always installed correctly!
Quite genuinely in this application, and with a quality stable grease, it really isn't an issue at all. However you could also use a copper anti-seize or something like Park Tool ASC-1, which I believe is aluminium-based.
Can i run this bottom bracket with my shimano M5100 deore crankset🤔and if so, what spacers would i need for 12x148 boost spacing on a 1x10 deore set up please sir👍
The spacers you need depend on the width of the bottom bracket shell (of the frame). Your crankset works with this BB, but the cranks need to be the 148 Boost version if that's your setup.
It's for 68mm and 73mm BB shell widths. You use the spacers to set it up, depending on your frame, as described in the Shimano Dealer's Manual (DM): bike.shimano.com/en-EU/product/component/deorext-m8000/BB-MT800.html
