SRAM GXP 83 Bottom Bracket
|Price:||$21.72 - $53.99|
|Sale:||Lower price available on select options|
- Material: (cups) alloy, (bearings) steel
- Threading: English
- Shell Width: 83 mm
- Claimed Weight: 118 g
- Recommended Use: super wide BB shells
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Many frames designed for extreme riding are built with an 83mm bottom bracket shell. It's a result of the wider axles used to optimize wheel stiffness to improve durability. The extra width in the back necessitates extra width in the cranks to get a proper chainline. If you have an 83mm shell and plan to run a SRAM/Truvativ GXP crankset, this is the bearing set you'll need. SRAM's GXP bottom brackets are brand specific -- meaning, they can only be installed with SRAM type cranks. The key element that makes them different from a Shimano or FSA bottom bracket is that the left side bearing has a smaller diameter to mate with the stepped spindle of the SRAM crank. This design allows the inner race of the left side bearing to be captured between the crankarm and the spindle, effectively locating the crank. The right side bearing "floats" on the spindle handling only radial loads as you pedal. The SRAM design optimizes bearing load, minimizes drag, and gives you durability. The GXP 83 Bottom Bracket has alloy cups and sealed cartridge bearings. It's compatible with Truvativ GXP mountain cranksets designed for an 83mm bottom bracket shell.
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I finally learned from the weightweenies road bike forum that it's a known issue with SRAM GXP cranks and bottom brackets. SRAM has not yet fixed the problem that the spindle where it is stepped down is 22mm (metric), yet the NDS bearing ID is 22.2mm (imperial 7/8"?). SRAM has said "it's no worry if you just crank the spindle and crank arm down tightly...
So, I have had a lot of trouble getting rid of crank arm play with my little over a month old SRAM Red GXP crank and a Team GXP bottom bracket. I read all about how it needs to be torqued above what one is used to, and I did - many times, with plenty of grease, but the crank bolt would bottom out before I could get rid of all the play. I measured the ID of the NDS bearing to be 22.2mm and while the NDS spindle diameter is 22mm. As the crank bolt is tightened, this difference is somehow taken up, but not completely.
This weekend I received a new GXP Team BB from amazon, who stepped up and sent it free-of-charge, despite being a few days out of the 30-day replacement window. This was manufactured the same week 2013, and likely from the same batch. On this the ID of the NDS bearing is closer to 22.15mm. Finally I was able to get rid of all crank arm play. However, after a couple of hundred km with the new BB, there is just a tiny amount of play, which I hope will go away when re-tightening the crank arm bolt yet again.
So that's unfortunate, can it be so hard for SRAM to use bearings in their BBs that fit the spindle better? With such a bad fitting bearing, it is likely it will need to be replaced much sooner than had SRAM used the right NDS bearing.
Why spend 4-5 times the amount for something that I have never had a durability problem with.
Yes I replace my BB every 2-3 years; but even so I can get 8-12 years of replacements for the cost of a Chris King or Phil Wood. (Besides the Chris King needs regular maintenance).
This newer model from SRAM/TruVativ has a much improved appearance, duplicating the curved bearing cup look found on the Kings and Woods.
Easily installed. Use a torque wrench to make sure you get it on tight enough. Install and forget. Repeat every 2-3 years as needed.
I have 4 bikes, this BB is on all of them.
(I ride 80 mile per week on my road bike, 20 miles per week on my singlespeed MTB, I rarely ride the remaining two)