Originally Posted by
fixedcycology
Thank you for both of your replies, I am glad I can put that BB30 nonsense to rest. I suppose my lack of practical experience with BBs had me second guessing myself. I will definitely study the page(s) from the Park Tool website and familiarize myself with the process and tools before starting the install. I have read that these GXP BB need to be faced properly to work, I was thinking maybe that is a job for my local bike shop.
It seems that I misunderstood the ISIS designation. I will have to take another look at that and see if I can't get a better understanding of what it means. If I could ask: The actual parts I was going to use was SRAM GXP cranks and Truvativ GXP BB Cups ( English Threaded ). Will this be okay?
I had been considering buying a new bike, I think for me though I would have to make the jump to a bike that was in the 4000 - 6000 euros range to get something that would be noticeably better. Right now I can't just can't afford or justify spending that much. I would love to be riding a Cervelo S3 or Cannondale Super 6 well there are plenty of machines out there I would like to be on.
My Cannondale though is a great bicycle, always a smooth ride.
1) Do *NOT* buy that truvativ/gxp crap. The cranksets suck, their bb's suck and shifting it will be at best, on par with a shimano double if not worse.
2)There is *nothing* to be gained by going to sram over shimano and everything to lose.
3) GXP is an external bottom bracket, especially for a road double. Has nothing to do with ISIS or anything as such. ISIS was relegated back into the octalink era and is obsolete and crap. The axle is built into the right crankarm as usual.
No aftermarket manufacturer FSA, Truvativ et al. make cranksets that shift better with shimano/campagnolo than their respective matching crankset.