How Many Spacers Should I Install On My MTB Bottom Bracket

How many spacers do I need on bb30a shell with Sram red 22 cranks with integrated spider? 🤔

The service you provide is invaluable to morons like me. Thank you

Спасибо Мужик! Отличный Гайд ! , Really appreciated so detailed and helpfull guide! Thank you!

Thanks. Do you need spacers on hybrid bike BBs or road bike BBs? Are spacers only for MTB BBs?

Does putting the wrong number of spacers cause a rough feel pedaling on the highest gear?

What if you installed a shimano hollowtech II BSA bottom bracket on a 73 mm shell without the per shimano recommended driveside spacer? I had no idea I needed to install the spacer, and everything seems to work fine, but i'm wondering what the function is of that 2.5 mm driveside spacer, or why it is needed? I'm using a shimano SLX M7000 1x11 crank, so no front derailleur or anything like that.

Cool. Just what I needed to know: 73mm DUB BB is no spacers on the BB itself, but a 4.5mm one on the crank axle itself on the drive side. This vid clearly earns a thumbs up. 👍

Is it safe to put all 3 spacer on the NDS to get my desired chainline?

Nice video. I was wondering if I can use The BB-Mt800 bottom bracket with out using the spacers. I currently have shimano xt m8000 11s drivetrain. My setup work good but I notice my chain line was a little off towards the 9-10 & 11 cogs. If I go to this cogs, If I back pedal it jump the chain…

Great video thank you

I could not clearly understand. I have a chain guide mounted on 73 mm shell. Do I need one spacer or none? My understanding is one spacer on the chain side, is that right. Thanks in advance.

Hi,

I just bought a Sensah/RX groupset. Somitd basically DUB.

68mm BB, added a spacer each side. Added the other spacer over the axle. When tightening up, not even close to 50nm, the cranks become quite difficult to spin. They don't spin freely at all.

Do you have any recommendations?

I also have a wavy washer I've installed on the left side.

Would you say that Sram rival (11 speed single ring crank) is a road or mtb gxp bottom bracket. I put two spacers either side of my gxp bb like it says but when i tighten it up the cranks struggle to spin? The frame is 68mm

thank you

Thank you!

I've put 3 spacers on the drive side but still my crank arm is close to the chain stay. What bottom bracket should I use? I am currently using a Chinese bb that came with my ixf crankset.

is it normal to have the padel-to-frame distance non-symmetrical?

I have xc which I intend to convert it to a 3x, so I should remove one of the spacer am I right?

Really helpful video, thank you very much

What if I have a bb30 83mm shell and want to fit a dub crank??

This was a saver, that was exactly my question. Cheers mate!

Can I use a 68mm BB in a 73mm frame shell?

Mint video

What makes no sense to me, is that on the box the bb comes in, is a check to show what the bb is compatible with. The mt-800 shows that it is only compatible with bsa 73mm. What then, is the purpose of the spacers? It seems that they're making a bb that's only compatible with a certain type of bb shell, why not stick with that, and have a single bb for every type of shell? Seems that it would make it much simpler

I spent the entire day researching BB, castes and cranks and was going crazy trying to find bottom bracket for 68, then i found this video and stopped freaking out and got furiously angry with myself :D. Excellent video thank you mate!

Thanks for clearing this up! I have a 73mm frame. But I'm going to use 1 spacer on each side of the BBT so in future I can easily remove the cups. Otherwise its just aluminum on aluminum tight, which after struggling with my old bottom bracket is a motherFer to get off lol.

Helpful video. My old bike crankset had a 52 mm chainline. Can I use my old crankset for bike with a 55mm chainline if I add 3mm spacer on the crank side

Thank God for your videos for us DYIers. Cheers!

thank you🙏

Are these fittings for boost, apart from the superboost explanation?

I have 73 mm, says i need 4.5 but on the outside right side...i think...if i'm reading the sram dub chart correctly, so I'd install without spacers and add the 4.5 to the right side before i install the crank arms right?

Why not putting the spacer on the non drive side and keep chain line on the drive side?

You don't explain why. It's not obvious to me why you used the same combo of spacers on both the 68 and 83 mm shells.

If you used the DUB on a 73mm and set it up like the boost back on bike with a 148mm rear with 27.5x3" tires would that throw the throw the chainline too far off? looking to gain a little bit of space between the tire and chain.

thx

Hi there.. I have a question.
Can I use a Dura Ace road BB on a MTB ?

excellent work!

Can't thank you enough! Cristal clear explanation ❤

Thanks for the info. This is the first video that actually makes sense.

Just fitted an Uber Bike BB 73mm. Really helpful tutorial, super easy to follow. I had replaced the shimano BB and never noted the spacer requirements. Thanks again.

Awesome thanks for this! I really wasn't sure! Its work noting the new MT801 BB are a different fitting, the splines have changed!

So the spacers are just to make the BB 73mm wide. I guess my bike got some work done at the factory and they made the BB 72mm~ they had one spacer from the factory so I just added one spacer. Should be good. Thanks man

mines a 68mm,with a bad bb,so for 68mm i would need 2 x 2.5mm spacers and a 4.5mm spacer for the crank? would that be right?

Tack!

My BB came with spacers but i dont think i need them as its nice and tight hopefully its ok

Do you think i need a spacer on the arm

My BB is 73mm and its a single speed conversion kit on a single 32T narrow/wide chainring do i still need a spacer

What’s a chain spacer ?

excelente explicación, desgraciadamente no hay videos en español que lo expliquen tan sencillamente y excelentemente, felicidades por su video

Great video, I never understood the Dub BB spacers - I do now!