Shimano Hollow Tech II Mountain BB Set Bottom Bracket

2/5 (5 Reviews)
MSRP : $47.76


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Product Description

Shimano Mountain Hollowtech II replacement Bottom Brackets


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Reviews 1 - 5 (5 Reviews Total)

User Reviews

Overall Rating:2
Value Rating:3
Submitted by Zachariah a Cross Country Rider from Palm Desert, California USA

Date Reviewed: September 16, 2009

Strengths:    -Far lighter than square taper, Octalink and ISIS bottom brackets
-Ease of installation(w/ BB tool)
-Spin smoothly
-Super stiff = direct power transfer


Weaknesses:    -Wash your bike frequently, and you will soon encounter crunchy bearing sounds when turning the cranks...NOT GOOD!
-Weak bearing seals
-Prohibitively expensive to rebuild


Bottom Line:   
KEEP THIS BB AWAY FROM ANY MOISTURE!!!

Learn to properly wipe-down your bike(PITA- takes nearly forever) because the bearings will FAIL if you even use mild water pressure. This BB should have a rust warning!

Expand full review >>

Favorite Trail:   Hurkey Creek Park(24 Hours Adrenalin Course)

Duration Product Used:   2 Years

Price Paid:    $35.00

Purchased At:   LBS

Similar Products Used:   TruVativ MegaExo - the BEST
Race Face X-type - the second WORST


Bike Setup:   2005 Cannondale F2000SL Hardtail - 19lbs of XC rocketry

Overall Rating:5
Value Rating:5
Submitted by Ericmopar a Weekend Warrior from Henderson NV

Date Reviewed: May 23, 2009

Strengths:    For me, they seem to last forever.
I can't understand the reviews below.
I know from talking to others, that they too have had very good luck with these bearings.


Weaknesses:    None that I know of.

Bottom Line:   
Most people I've talked to are like me, they have had very good luck with these. They have outlasted my old UN types, by a far stretch of time.
Don't even get me started on ISIS and 90 day lifespans, at $80 a pop.
I've gotten more than 2 years and over 4000 miles each, out of two sets, riding in the desert. More than 8000 miles total in 5 years, with a 04, LX Hollowtech II crankset.
I replaced one set while they were still turning smooth.
The other set got replaced recently, only because I got new BB bearings with a new SLX crankset.
The local mechanics have told me, that the problem seems to be people pressure washing after rides.
That and over tightening the tension knob on the non drive side.
It is also a problem for people with unsquare BB shells.
IE, BB shells that aren't faced properly.

Expand full review >>

Favorite Trail:   Bootleg

Duration Product Used:   More than 3 years

Price Paid:    $40.00

Purchased At:   LBS

Similar Products Used:   Old UN-52, 72.
ISIS (true crap).


Bike Setup:   All mountain.

Overall Rating:1
Value Rating:1
Submitted by jtlmd a Racer from Ohio

Date Reviewed: April 10, 2009

Strengths:    It spins when new

Weaknesses:    Durability

Bottom Line:   
Been through 3 sets of these BB cups in the past 3 1/2 years. After a muddy ride they often seize and stop spinning. I've learned how to overhaul them myself, despite shimano saying they are not serviceable. I've learned to keep a spare set in my toolbox! Shimano needs to fix this system. (I've had a set replaced under warranty as it lasted only a few months, and another set has been sent back for warranty replacement).

Don't buy these BB cups unless your bike never gets muddy.

Expand full review >>

Duration Product Used:   More than 3 years

Similar Products Used:   Remember how durable the sealed cartridge BB's were! I have one of those over 10 years old and still working fine.

Bike Setup:   Blur XC, XT crankset

Overall Rating:1
Value Rating:1
Submitted by Brazilianbreeze a Weekend Warrior from henderson, NV, USA

Date Reviewed: March 8, 2009

Strengths:    Smooth at first

Weaknesses:    durability, becomes crunchy when climbing

Bottom Line:   
This BB was crunchy and felt like it had a bucket of sand in it within the first 2 months of owning it. I had my LBS inspect it, clean and lube it and they said it was fine. I took it out the next day and it was still crunchy. I wouldn't recommend this to anyone.

Expand full review >>

Favorite Trail:   Skyline

Duration Product Used:   6 months

Purchased At:   came with bike

Bike Setup:   07 Scott Ransom 10

Overall Rating:1
Value Rating:1
Submitted by millerkwm1 a Cross Country Rider from reisterstown,md

Date Reviewed: January 25, 2009

Strengths:    shop had it in stock

Weaknesses:    not made to last. don't buy it if you want quality. shimano is laughing all the way to the bank

Bottom Line:   
garbage

Expand full review >>

Favorite Trail:   rocky

Duration Product Used:   1 Year

Price Paid:    $40.00

Purchased At:   local shop

Similar Products Used:   oe that came with xt cranks


Reviews 1 - 5 (5 Reviews Total)

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