Hollowtech II bottom bracket spacers explained

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Should you put spacers on both the right and the left-hand side cups? How many spacers and which thickness?
I tried answering those questions along with explanations why.
CONTENTS:
00:00 Introduction
01:34 3 notes
03:07 3 goals
06:54 BB shell width and diameter
12:05 Threaded bottom brackets
15:47 2.5 mm "default" right spacer
18:17 Road bike BB cups
21:18 MTB BB cups
23:54 How to check if it's all good
27:17 Wider (boost) frames and press-fit
29:21 Catches and gotchas
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How to install Shimano Hollowtech II bottom bracket - video:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-0uS71UrROMc.html
What is a bicycle chainline and how to measure it? - video:
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Bicycle chainline - article:
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Accuracy vs Precision - article:
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Threaded bottom bracket standards, thread pitches, and diameters - article:
bike.bikegremlin.com/1634/bicycle-bottom-bracket-standards-explained/
Threadless (press-fit) bottom bracket standards and dimensions - article:
bike.bikegremlin.com/1652/press-fit-bb/
T47 threaded bottom bracket standard:
bike.bikegremlin.com/1672/new-threaded-bb-standard-t47/
Anti-seize (mounting) pastes and greases - video:
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Опубликовано:

28 июн 2023

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Комментарии : 34

@AnahiltMG 3 месяца назад

Shimano SMBBR60 bottom brackets made for frames with a 68mm bottom bracket shell DO NOT require any spacers. This video is wrong. For example, if you have a road bike frame with a 68mm shell and you buy the 68mm version of the Shimano SM-BBR60 bottom bracket then Shimano does not supply spacers with it - because NONE are needed! If anybody followed the advice above and put in spacers that they had laying around, in the example given in this video, then that would be wrong.

@BikeGremlinUS 3 месяца назад

Fair point - though it does depend on the particular frame and cranks. Sometimes (not rarely enough) you need a spacer before the right hand side cup in order to get the axle protruding just the right amount (there is a bout +-1 mm "wiggle" room for the left crank fitting) and have them be symmetrical relative to the frame's centre line. Relja

@kame83 2 месяца назад

@@AnahiltMG Can you tell for which rear chainline this will work without spacers? The reason I am asking is I keep reading that no spacers are required with a bsa 68mm bb, but stil in my Cinelli veltrix frame the chainline with my ultegra r8100 crank set seems too far left and makes the higher gears towards 50-34 run like sh*t. I had the same setup on a scott speedster with a quick release setup and it ran fine. Now with the 142mm thru axles there seems to be a problem with the chain line. Can this be the reason?

@petheato3291 27 дней назад

Thanks so much for this video, very informative and you are a good teacher

@luism644 10 месяцев назад

Awesome and incredibly informative video. Thanks!

@a1lover78 Месяц назад

Thank you for taking time to explain buddy.

@markw8139 8 месяцев назад

Great video. Relax too my friend it is difficult when your first language is not English. Really great information... One question....I have a 68mm bottom bracket (cyclo cross bike). I bought a Hollowtech Road style Bottom Bracket (BB52 I think). It didn't come with any spacers.. So I should add 1 2.5mm spacer on the chainside crank ...Thanks if you get this !🙏👍👍

@BikeGremlinUS 8 месяцев назад

Hi, Thanks. :) For any technical questions and help, please use the BikeGremlin forum: www.bikegremlin.net/ Relja

@test40323 Год назад

Learned a lot. Thanks!

@BikeGremlinUS Год назад

Glad to hear that. I enjoy making videos and articles, and knowing that it helps at least one person makes it worthwhile - knowledge multiplies when you share it. :)

@mainicow Год назад

Great video! Love the way you convey the reasoning and logic behind every decision!

@BikeGremlinUS Год назад

It's easier (for me at least) to learn and memorize that way. When you understand the logic, you can always work out the needed details. That helps a lot when something is non-standard or out of the ordinary.

@BikeGremlinUS Год назад

If you have any questions, please use the BikeGremlin forum (I try to respond to every comment, but RU-vid sucks at notifications, especially when it comes to any follow-up questions): www.bikegremlin.net/ Relja

@D3cyTH3r 11 месяцев назад

Super useful - Thank you!

@jackal5458 7 месяцев назад

Nice video. I have a pressfit BB92 and my bike manual says that 2.5mm spacer is not needed. I’ve replaced the BB and bike shop fitted 2.5mm spacer on drive side. Everything is working smooth now. Why did they say that the spacer is NOT needed ?

@BikeGremlinUS 7 месяцев назад

One good measurement beats a thousand expert opinions. You could measure the front and the rear chainline, and check your crank arm symmetry to see if it's all good. For example: Different cranks have different chainring positions, so maybe the bike shop concluded that the spacer will help get the chainline closer to optimal. But, more imporant than that: is the bike working and shifting fine? Relja

@mr.lonely52 7 месяцев назад

@BikeGremlinUS what is the proper chainline triple chainring hallowtech Bottombraket non-boost frame?? If best you make a video about it❤🎉😊thank you so much new biker.

@BikeGremlinUS 7 месяцев назад

As I like to say, one correct measurement beats a thousand expert opinions. So, the safest route is to measure your rear chain line and try to match that with the front chain line. Generally it is about 50 mm for most Shimano MTB triple cranks, and about 45 mm for Shimano Road triple cranks. Relja

@mr.lonely52 7 месяцев назад

@@BikeGremlinUS thank you soo much sir🥰❤️

@alendiamondz Год назад

Nice video, but little too complicated for me. 😅Can you tell me, if the BB is 68/73mm and the width of the shell is 68mm, and I am using the triple front crankset, do I need to install 2 spacers of 2.5mm, and where, one on the left and one on the right or somewhere else? I tried with one spacer on the right side and it looks like I could fit another one (my crank is able to move left and right just a little bit).

@BikeGremlinUS Год назад

In most cases, with Shimano BBs and cranks, that would be 2.5 mm on the left, and 5 mm (2 x 2.5 mm) on the right. Relja

@vknez6610 9 месяцев назад

My width is 86,5 mm and I am installing T47 BB which is 48,5 mm wide (16 teeth). Crankset will be GRX600 10 speed. With BB I received 3 spacers 1/2/3 mm, and can not find info what is proper way to install it (which spacer, on which side)

@BikeGremlinUS 9 месяцев назад

Hi, Please use the BikeGremlin forum for the technical questions: www.bikegremlin.net/ Relja

@xrv404 11 месяцев назад

Hello Sir, Can you tell me, I have 68mm BB on Cube mtb hardtail, is it always 2 spacers on the right and 1 spacer on the left? No matter what crankset? If I change from triple crank to one by crank is the spacer still the same on bottom bracket?

@BikeGremlinUS 11 месяцев назад

Hi, Please use the BikeGremlin forum for questions: www.bikegremlin.net/ Relja

@Gledii 11 месяцев назад

thanks a lot for sharing. i need to increase my chainline by 2-3mm but my spindel is in the bracket and not attached to the pedal. how to add a spacer on this case?`or do i need a longer spindel`? thanks

@BikeGremlinUS 11 месяцев назад

Hi, Please use the BikeGremlin forum for any questions & answers: www.bikegremlin.net/ Relja

@johnmills837 Год назад

#2 on you list is not critical and will no effect pedaling. Chain line is most important. In my situation I have a 73mm with the one 2.5mm on the drive side. I have a 141 boost QR frame using a 142 TA hub with adapter. My front chain line is 48mm my rear is almost perfect at 49mm. I'm using a knock off 24mm Hollowtech II crank Teyssor branded similar to the iXF one.