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If not SRAM Red Crankset BB, what's my other options?

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If not SRAM Red Crankset BB, what's my other options?

Old 09-13-11, 02:42 PM
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ahson
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If not SRAM Red Crankset BB, what's my other options?

My bike has Sram Red groupset except the crankset, BB, and RD. I read a lot of negative feedbacks on how flexy the Sram RED crankset BB is. It kinda scared me and make me look for alternatives for it. What else is available about that same level?
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Old 09-13-11, 02:48 PM
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Hope, Chris King, VCRC, Token
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Old 09-13-11, 03:42 PM
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ericm979
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I have an Sram Red crank and BB. The crank is stiff (not that a flexy crank will slow you down but that's another subject). I suggest that you make up your own mind about the Sram stuff. I have had a lot of cranks and I am pretty happy with the Sram cranks. You can read the Fairwheel Bikes crank test and check the Red crank's stiffness for yourself. (it's highly rated, but heavier than boutique cranks). The newer GXP BB spins very freely (apparently there was an older one which didn't and the reputation continues).

One of the great things about the GXP BB design is that the bearings are not preloaded. Frame BB shell width varies (about 1mm variance is what a typical BB is designed for). Deep groove ball bearings, which is what are used on almost all BBs, can't handle preload. If they are preloaded more than a little bit they die. Most cranks have a mechanism to adjust the preload and cope with frame variance. But if you get the adjustment wrong you will either have play or kill the bearings quickly. The Sram design has the spindle clamping the non drive side bearing's inside race and floating in the drive side bearing. There is no preload so there is no adjustment to get wrong. It's dirt simple and works well.

Some aftermarket BBs do away with that simple system and require you to adjust preload. With shims! What a pain in the ass. You will have to install and remove the crank a number of times to get it adjusted correctly. I suggest reading the BB's install instructions before buying.

If my GXP died I would either replace it with another (it's only $35) or buy some replacement bearings and the Enduro puller.
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Old 09-13-11, 04:03 PM
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canam73
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Originally Posted by ahson View Post
My bike has Sram Red groupset except the crankset, BB, and RD. I read a lot of negative feedbacks on how flexy the Sram RED crankset BB is. It kinda scared me and make me look for alternatives for it. What else is available about that same level?
What did you read was flexing? The crank or the bottom bracket?
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Old 09-13-11, 04:08 PM
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You're not fat enough to flex a Red crankset. That said, if you aren't doing power and plan to consider a Quarq power meter. Otherwise just pick one. Force perhaps? GL
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Old 09-13-11, 05:10 PM
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Originally Posted by ahson View Post
My bike has Sram Red groupset except the crankset, BB, and RD. I read a lot of negative feedbacks on how flexy the Sram RED crankset BB is. It kinda scared me and make me look for alternatives for it. What else is available about that same level?

incorrect
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Old 09-13-11, 06:25 PM
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Originally Posted by ahson View Post
My bike has Sram Red groupset except the crankset, BB, and RD. I read a lot of negative feedbacks on how flexy the Sram RED crankset BB is. It kinda scared me and make me look for alternatives for it. What else is available about that same level?
If you don't have the SRAM Red BB, why do you need to look for alternatives for it? What BB and crank are you using now?
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Old 09-13-11, 08:27 PM
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The "flex" you read about is with the chainring. The early batches of the Red chainrings would literally fold under power. That issue has long been resolved.

Don't worry about flexing the crank...because you won't.
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Old 09-13-11, 08:57 PM
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ahson
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Cool thanks guys. I'll go get the SRAM Red crankset BB then.
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Old 09-14-11, 08:00 AM
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Originally Posted by ahson View Post
My bike has Sram Red groupset except the crankset, BB, and RD. I read a lot of negative feedbacks on how flexy the Sram RED crankset BB is. It kinda scared me and make me look for alternatives for it. What else is available about that same level?
Where do you get your information? Flexy?? Yeah, Ok.

The facts show SRAM Red is one of the stiffest cranks. DuraAce, which is probably one of the stiffest, is just barely so in some respects. There is a weight penalty over some other cranks, but some pricey boutique cranks are not as stiff. 630gms for BB30 isn't a weight penalty. Shoot, feven 760gms isn't when you are talking your cranks. That is the last thing I care about weighing an extra 50gms.


Here you go, some data.


https://fairwheelbikes.com/cycling-bl...nk-test-4.html
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