||03-02-14 12:33 AM
Originally Posted by expatbrit
So -- Trek X-Cal. Blowing spokes at a great rate ON road, with a 195lb rider.
Fixed a couple, shop said 'we'll warranty the wheel'. Great, I thinks. That sounds good.
So the 'warranty' wheel turns out to be a StaTru rim, though on a shimano hub. Original X-Cal wheels were Bontrager Mustang TLRs.
I've no real basis for comparison; shop claims the new rim is 'better' and 'sturdier'. Not too worried about weight, but a quick google suggests that StaTru rims are pretty Cheapy McCheaperson?
Did I get stuffed?
Bontrager Mustang TLR is a tubeless-ready rim
, much more expensive and versatile than a comparable non-tubeless ready rim. Mountain bikes with tubeless ready wheelsets are a big upgrade and upcharge versus an identical mtb without tubeless-ready wheelsets. If the replacement rim isn't tubeless-ready, you got STUFFED!
Not sure why they didn't provide an identical replacement. You want to make sure they have properly trued AND tensioned the replacement wheel. I'm willing to the bad wheel was a rear disc wheel that was never removed from the bike, trued, and tensioned during the initial build. Because it's disc brake wheel where rim brake rub isn't an issue, many shops don't bother truing the wheels. They forget that high, even tension is needed for the wheel to be strong regardless of whether it's rim or disc brake. Low, uneven tension=weak wheel.
There's no reason why a properly tensioned wheel with a good quality hub and rim (such as the Mustang) should break if ridden on the road and not abused.
Look at the wheel. You'll see pairs of spokes cross on both the right and left side of the wheel. Pluck each of the spokes on a pair. They should emit the same tone-"ting/ting". If you hear a "ting/tong", you know one spoke is at a higher tension than it's crossing companion. When subjected to a side load, such as when cornering, the spoke at the higher tension takes more stress. High enough stress and a big difference in tension will result in the rim bending, the high tension spoke cracking the rim at the nipple eyelet or any number of other modes of failure.