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Bottom Bracket

Posted: Thu Apr 18, 2019 6:50 am
by WorkonSunday
Dear all, I have a 2012 Merida Scultura which has some 105 (10 speed) bits. I recently got hold of a set of SRAM Force 22. As far as i can tell the bike has a threaded bottom bracket (review says: "The frame uses a regular screw fit BB"), any idea if the crank will fit? (im quite new to SRAM stuff, i think there are two different designs? BB30 vs GXP? any idea how i can tell?) Many thanks.

Re: Bottom Bracket

Posted: Thu Apr 18, 2019 8:49 am
by 1415chris
If spindle appearance doesn't tell you anything, just measure it's diameter. BB30 has 30mm, GXP 24/22mm.
You have a good chance that neither of these cranks will fit without new bottom bracket.
What crankset is on the bike right now?

Re: Bottom Bracket

Posted: Thu Apr 18, 2019 8:49 am
by Weenie

Re: Bottom Bracket

Posted: Thu Apr 18, 2019 8:56 am
by TobinHatesYou
If the spindle is permanently attached to the DS crankarm, it's GXP. It will also be hollow on that side. If there is a hex interface on the DS, then it's 30mm.

Re: Bottom Bracket

Posted: Thu Apr 18, 2019 9:25 am
by Attermann
TobinHatesYou wrote:
Thu Apr 18, 2019 8:56 am
If the spindle is permanently attached to the DS crankarm, it's GXP. It will also be hollow on that side. If there is a hex interface on the DS, then it's 30mm.
some of the early BB30 versions had the spindle attached to the drive side like GXP

Re: Bottom Bracket

Posted: Thu Apr 18, 2019 11:56 am
by filip00
Spindle being attached means nothing.

Short differences that'll help you out:
On the frameset
-is the bearing external or internal? If internal, it might be BB30 or PF30.
-if the bearing is external, it's probably threaded. If it's threaded, you gotta check if it's ITA or BSA thread - I'm guessing it's BSA.
-if the bearing is external, its diameter is likely 24mm, but it can also be 30mm (FSA megaevo for example), You should measure it

For sram GXP - you need an external, threaded, truvativ/sram GXP bottom bracket.

Second question is - what sort of sram crankset do you have? Spindle diameter is 30 or 24mm?

Re: Bottom Bracket

Posted: Wed Apr 24, 2019 11:23 am
by WorkonSunday
Thanks chaps. looks like i have the GXP version. (it's smaller than the 30mm EVO386 SLK and Rotor Aldhu cranks i have). Cheers.

Re: Bottom Bracket

Posted: Wed Apr 24, 2019 2:12 pm
by alcatraz
Standard threaded bottom brackets (bsa) are very nicely compatible with gxp cranks. Just get a simple sram gxp bsa bottom bracket.

Re: Bottom Bracket

Posted: Thu Apr 25, 2019 8:35 am
by filip00
alcatraz wrote:
Wed Apr 24, 2019 2:12 pm
Standard threaded bottom brackets (bsa) are very nicely compatible with gxp cranks. Just get a simple sram gxp bsa bottom bracket.
Seconding that, I just finished a master frameset with ITA threaded BB, I used a sram ITA GXP BB, which worked fine with the GXP crankset.

Re: Bottom Bracket

Posted: Thu Apr 25, 2019 4:57 pm
by WorkonSunday
thanks for the input guys! :D

Re: Bottom Bracket

Posted: Thu Apr 25, 2019 4:57 pm
by Weenie

Re: Bottom Bracket

Posted: Thu Apr 25, 2019 8:06 pm
by kode54
If its threaded...make sure its either English or Italian before ordering the bottom bracket.