SRAM GXP bottom bracket opinions/quality

uad782
Posts: 324
Joined: Sun Aug 02, 2015 5:51 pm
Location: Somewhere near Malabugilmah

SRAM GXP bottom bracket opinions/quality

Postby uad782 » Fri Jan 26, 2018 7:54 pm

Hi Everyone,

My Fargo's SRAM GXP 73mm BSA bottom bracket is nearing failure after less than 12 months. There is some play in the cranks.

I am interested in opinions of quality of these BB's.

I also wonder if I could use a Hollowtech II with the Hope adaptor or if there are any other adaptors.

I also don't like the fact SRAM won't let me buy a new BB online from overseas where I can get it $20 cheaper.

Any comments appreciated.

User avatar
Duck!
Expert
Posts: 7123
Joined: Tue May 21, 2013 8:21 pm
Location: On The Tools

Re: SRAM GXP bottom bracket opinions/quality

Postby Duck! » Fri Jan 26, 2018 8:53 pm

If you're using a GXP crank, you MUST use a GXP bottom bracket. Unlike (largely misinterpreted) Hollowtech II/MegaExo systems, GXP has a stepped spindle with a 22mm left end, rather than the straight 24(.something)mm spindle of the others. Shamefully typical of SRAM, the concept is good in that the stepped spindle clamps the inner race of the left bearing between the spindle and left crank, in theory making it impossible to overload the bearings, because the right side is essentially floatimg, but in reality the concept is let down by the quality of execution. There are other manufacturers of GXP-type bottom brackets, with varying levels of quality.
I had a thought, but it got run over as it crossed my mind.

User avatar
queequeg
Posts: 5394
Joined: Thu Dec 17, 2009 10:09 am

Re: SRAM GXP bottom bracket opinions/quality

Postby queequeg » Fri Jan 26, 2018 9:14 pm

uad782 wrote:Hi Everyone,

My Fargo's SRAM GXP 73mm BSA bottom bracket is nearing failure after less than 12 months. There is some play in the cranks.

I am interested in opinions of quality of these BB's.

I also wonder if I could use a Hollowtech II with the Hope adaptor or if there are any other adaptors.

I also don't like the fact SRAM won't let me buy a new BB online from overseas where I can get it $20 cheaper.

Any comments appreciated.


It depends on how well you look after them. I have ruined a GXP bottom bracket by riding through water that was over the bottom bracket. Water got into the bearings and they were done. However, if you maintain them by taking your crank out and carefully popping the plastic seal and dust cap off the top of the bearings, and refill them with some fresh grease, they will last for ages. I was easily getting 10,000+km from a bottom bracket. The one I just pulled off my bike has been on there since August 2015, and has done over 20,000km. All it takes is regular serving to keep the bearings running smoothly. It's still showing little signs of play, but I have just removed the GXP cranks from my bike and fitted my Rotor 3D+ instead, so I am now using a BSA30 bottom bracket.

If you want something non-SRAM, have a look at the Wheels Manufacturing ones such as https://wheelsmfg.com/bottom-brackets.html?bb_standard=6860&crank_spindle_dia=7120

or Wishbone does one as well.

http://www.wishbonetw.com/product-1.php?id=102

With the wheels manfacturing ones, the bearings are replaceable, so you don't have to ditch the cups each time.
'11 Lynskey Cooper CX, '00 Hillbrick Steel Racing (Total Rebuild '10), '15 Cervelo S5

User avatar
baabaa
Posts: 849
Joined: Sun Apr 19, 2009 8:47 am

Re: SRAM GXP bottom bracket opinions/quality

Postby baabaa » Fri Jan 26, 2018 9:52 pm

Yeah hard to get a good run out of a sram bb if you ride in any sort of rain, mud or muck so I do use one of these with a hope 68/73 mm bb on a stylo GXP single speed crankset
https://www.sjscycles.co.uk/bottom-brac ... t/?geoc=AU
I think I tried to fiddle around and use a shimano bb (Ultegra SM-BBR60 and then a 6700) with the hope adapters but the fit was quite snug around the axle, got a tad frustrated so gave up and went back to the hope which just works.

uad782
Posts: 324
Joined: Sun Aug 02, 2015 5:51 pm
Location: Somewhere near Malabugilmah

Re: SRAM GXP bottom bracket opinions/quality

Postby uad782 » Sat Jan 27, 2018 2:46 pm

Thank everyone,

Baabaa, that is the adaptor I was talking about. Sounds like it doesn’t work with Shimano. Are the hope hubs ok and does the adaptor work well?

With the hope hubs I gather you can replace the bearings. Is this correct?

am50em
Posts: 404
Joined: Sat Aug 28, 2010 10:21 pm
Location: Sydney

Re: SRAM GXP bottom bracket opinions/quality

Postby am50em » Sat Jan 27, 2018 2:50 pm

Maybe these with replacable bearings?
https://www.uberbikecomponents.com/view ... tible#tab1

User avatar
baabaa
Posts: 849
Joined: Sun Apr 19, 2009 8:47 am

Re: SRAM GXP bottom bracket opinions/quality

Postby baabaa » Sat Jan 27, 2018 5:58 pm

Um Hope hubs? Yes I have a few sets of these, one rim braked the other just a rear 135/ 6 bolt (a sp dyno up front), have been issue free in regard to bearings to date but I don't think I am hard on gear. The Hope BB if is that what you are asking about is just the standard stainless steel bearing job and has been no trouble for the past three years, again I am soft on gear but being single speed it has been run with a set tension so I may like that, dunno but the sram bb didnt....
To me all of hope stuff seems pretty good ( use hubs, stems, bbs, seatposts, skewers)

uad782
Posts: 324
Joined: Sun Aug 02, 2015 5:51 pm
Location: Somewhere near Malabugilmah

Re: SRAM GXP bottom bracket opinions/quality

Postby uad782 » Sat Jan 27, 2018 10:54 pm

Sorry I meant Hope bottom bracket. Just ordered one and the adaptor from the UK.

Appreciate everyone’s advice.

User avatar
geoffs
Posts: 369
Joined: Wed Feb 21, 2007 10:16 pm
Location: Inner west, Sydney

Re: SRAM GXP bottom bracket opinions/quality

Postby geoffs » Tue Jan 30, 2018 11:58 am

I'm using a Chris King GXP BB on my wifes bike and it's lasting well so far.
If you want to buy SRAM parts and groupsets online then have a look at Starbike in Germany

User avatar
im_no_pro
Super Mod
Super Mod
Posts: 6018
Joined: Thu Oct 23, 2008 10:29 pm
Location: Geelong

Re: SRAM GXP bottom bracket opinions/quality

Postby im_no_pro » Wed Jan 31, 2018 11:01 am

I've had no issues with mine. Replaced it about 18 months ago but that was after 8 years of service (but not the volume of km's many on here would do in 8 years). I went into my (known to be expensive) LBS with a reasonable level of trepidation purely because I wanted one on the spot. Their off the shelf price was cheaper than what I had found online, which was both pleasing and incredibly surprising.
master6 wrote: Moderators are like Club Handicappers; I often think they are wrong, but I dont want the job.

Who is online

Users browsing this forum: find_bruce