Bottom Bracket

Discuss light weight issues concerning road bikes & parts.
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WorkonSunday
Posts: 116
Joined: Tue Jan 16, 2018 4:39 pm

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.
In the house: Colnago V1r, Colnago A1r, Wilier Cento1 Air, Scott Scale 700SL, Bianchi FSE, Colnago Concept, Colnago A1r, Specialized Ruze Pro, Wilier GTR, Argon 18 E117 Tri+, Brompton B75

by Weenie


1415chris
Posts: 1280
Joined: Sat Apr 18, 2009 8:59 am
Location: Surrey UK

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?

TobinHatesYou
Posts: 4163
Joined: Mon Jul 24, 2017 12:02 pm

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.

Attermann
Posts: 384
Joined: Sun Jan 05, 2014 11:04 pm
Location: Denmark

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

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filip00
Posts: 38
Joined: Thu Apr 11, 2019 6:30 pm
Location: slovenia

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?

WorkonSunday
Posts: 116
Joined: Tue Jan 16, 2018 4:39 pm

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.
In the house: Colnago V1r, Colnago A1r, Wilier Cento1 Air, Scott Scale 700SL, Bianchi FSE, Colnago Concept, Colnago A1r, Specialized Ruze Pro, Wilier GTR, Argon 18 E117 Tri+, Brompton B75

alcatraz
Posts: 2202
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Standard threaded bottom brackets (bsa) are very nicely compatible with gxp cranks. Just get a simple sram gxp bsa bottom bracket.

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filip00
Posts: 38
Joined: Thu Apr 11, 2019 6:30 pm
Location: slovenia

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.

WorkonSunday
Posts: 116
Joined: Tue Jan 16, 2018 4:39 pm

by WorkonSunday

thanks for the input guys! :D
In the house: Colnago V1r, Colnago A1r, Wilier Cento1 Air, Scott Scale 700SL, Bianchi FSE, Colnago Concept, Colnago A1r, Specialized Ruze Pro, Wilier GTR, Argon 18 E117 Tri+, Brompton B75

kode54
Posts: 1617
Joined: Tue May 23, 2006 9:39 pm

by kode54

If its threaded...make sure its either English or Italian before ordering the bottom bracket.
- Factor 02 Disc + DA9170 + Enve 4.5AR CK CL hubs
- Moots Vamoots Disc RSL Titanium + DA9170 + Enve 3.4AR CK CL hubs
- Parlee Altum + DA9150 + Enve SES 4.5 Ene carbon hubs
- Argonaut Spacebike 2.0 + DA9170 + Enve SES 5.6 DT Swiss 240 CL hubs

by Weenie


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