Soldato
- Joined
- 23 Nov 2004
- Posts
- 10,646
Is that a bb86 to BB30 bearing?
Is that a bb86 to BB30 bearing?
Pinch flat paranoia! Another good reason to go Tubeless on a road bike....I'm forever looking down at my rear tyre while riding, wondering if it feels a little low, worried I'll get another pinch flat. This just means I can see all the time what both pressures are. It's not to tell me if I actually have a flat...
Also, twice in the last month my front seems to have dropped to about 40psi, but most times it seems fine. I don't really get what's happening. Is it a slow puncture, is something happening at some point to drop a load of air? This will make it easier to see what's happening.
RRP is £200.
To be fair when I was looking at alternatives to the £600-700 PWM, then changing BB and cranks for ~£200-250 was a no brainer as it opened up the cheaper crank arm PWM options. Now I'm on Shimano R8000 cranks I don't think I want to ride anything else (having previously ridden FSA Gossamer, Praxis Zayante and several versions of earlier Shimano 105). To me it just feels totally stiff, solid and is incredibly light compared to the others. For not crazy prices.It will be going on my felt with the shimano chainset rather than any of the Cannondale I'll be riding.
Doh! Damn thats a fair crack. Quite surprised it would crack the outer race like that rather than the balls or just wearing the balls and races. But I guess it's the pressure of it which cracks it (no space to bend) before things wear away enough to relieve things...
That's a ceramic bearing? Doesn't look it (not that I've seen or pulled one apart).Glad I didn't pay full price as its the ceramic bb too.
Does the NDS bearing in GXP take lateral loads from both sides as it's 'fixed' in place? Think that's what the Praxis did, for me it just wore out the NDS bearings quite quick, while the DS was totally fine.Haha good shout mate. Is that the left hand cup?
Wonder if it's due to the loads placed on the inner race due to the way gxp works.
BB bearing. Clue is in the size, wheel bearings are quite a bit smaller and have quite a bit thinner races with smaller balls all crammed together (and @SoliD would have to have tiny weeny hands!)is that a wheel bearing ?
Depend what you mean by 'work'! Could argue they get far more and have a harder life! More flex, more lateral movement and more ingress. Poor things!oh right ok, gets just as much work as a wheel bearing though i suppose !
Depend what you mean by 'work'! Could argue they get far more and have a harder life! More flex, more lateral movement and more ingress. Poor things!
What sizes did you get off the bearings?
Loads of brands use different sizes for different sized frames. 1 1/4"(47mm IS47) on smaller bikes and 1 1/2"(52mm IS52) on larger bikes.
Specialized are one of the only brands that use 1 3/8"(49mm IS49).
https://www.airevelobearings.com/product/specialized-s-works-tarmac-headset-kit/
Not sure, you thinking of using a different bearing without the lip? I can't see an issue with that if there's a shoulder internally for it to sit on but if there is it begs the question why they would make a fancy bearing.Does the headtube have a chamfer on the inside once you've got those cups out?