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Shimano XT SM-BB70 Bottom Bracket

Item #: BB276E00
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Shimano XT SM-BB70 Bottom Bracket

The standard XT bottom bracket is a mainstay of modern mountain biking. This replacement set of Hollowtech II outboard bearing bottom bracket cups for Shimano XT M770 series of cranksets offers smooth, stiff performance for all Shimano cranks. Will also work for any Hollowtech II type mountain bike cranksets such as Shimano Deore or XTR. Note: Not compatible with Road type Hollowtech cranks.
  • Includes Left and Right Cups
  • English Threaded
  • Fits 68 or 73mm bottom bracket shells (most modern mountain bikes)
  • SM-BB70

4.5 / 5.0
40 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
20
18
2
0
0
Just works
This product is pretty good. It says it's not serviceable, but you can pop off the seals and relube the bearing. Don't overtighten.

PROS: Simple, Serviceable Actually, Light

CONS: Avoid Overtightening
September 17, 2012
Location:
Michigan
Rugged and Smooth
Easy to install and well sealed. I regularly ride in the rain and pick up a lot of mud on the drive train. The BB70 is well sealed and is resilient to water - if serviced regularly.

PROS: Lightweight, Durable
May 4, 2016
Location:
San Jose, CA
Smooth
Used this BB along with an XT crankset and it's very smooth. Easy to install. You need the external BB tool that grips around the outside teeth.

PROS: Easy To Install, Lightweight, Smooth
June 18, 2013
Location:
Ontario
Exactly as Ordered...Arrived Fast
Price was comparable...ordered enough stuff for free shipping....Direct replacement on my 2008 Jamis Dakar XAM 1.0. The first Bottom Bracket lasted 4 years through East Coast Mud and winters so I can't complain.
July 31, 2012
Location:
Baltimore, MD
nice b/b
easy to install ,quality looks great .is very smooth

PROS: Attractive Design, Easy To Install, Durable

CONS: None yet

BEST USES: Upgrade, Casual Riding, Mountain Biking
January 27, 2013
Location:
HornLake,Ms.
smooth
i replaced my old slx bb with these. made a big difference

PROS: Smooth
June 26, 2012
Location:
norcal
Solid BB
I like the design of the Shimano MTB crankset and BB. I like this BB as it is easy for a home mechanic to maintain and replace with only a single special tool. I've used a Shimano drivetrain on all my bikes, so I can't comment for comparison on durability. I tend to get around 1200-1500 miles out of the XT BBs that I have had.

PROS: Lightweight, Easy To Install, Attractive Design
November 14, 2012
Location:
Northern, VA
smooth and light
Service was up to my expectations. I bought a crank set but by factory one cup was not in the package. But Jeff (online chat) understood the problem and delivered a separated BB with no cost.
For me It's a warrantee of Jenson.

PROS: Easy To Install, Lightweight, Clear Instructions

CONS: Bearings Hard To Find, Not Enough Grease, Cost Of Bearings

BEST USES: Mountain Biking, First Step To Go Pro, Upgrade
July 23, 2013
Location:
Quito - Ecuador
Typical Shimano - good stuff
yes

PROS: Durable
May 12, 2016
Location:
Memphis
It goes around and around well.
Quick

PROS: Durable, Easy To Install

CONS: NONE
June 16, 2015
Location:
KY

Q & A

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Browse 1 question Browse 1 question and 1 answer
My new frame has a BB30 shell but there are no threads. What am I missing to install this bottom bracket? Do I need to press in some threaded cups?
curious on Jun 2, 2016
BEST ANSWER: Sounds like you need a press fit bottom bracket.

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Get free shipping with your $50 purchase today when you choose Standard Shipping at checkout. Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items

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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.