It's a bit hard to tell what's going on since only one of your photos is in focus, so the following is a bit of guesswork.
Given it looks like a perfectly straight crack half way between two spokes, I'm guessing it's a "pinned" rim (spot welded), and you've cracked the lump of alloy that the join is spot welded to. If the crack is exactly opposite your valve, then my guess is correct.
I've done similar to a MTX in the past. If the spokes are correctly tensioned, they will hold the rim together pretty well. I had one that was cracked all the way through the join AND the vavle hole, it was still ridable.
Not ideal, but if you ride smoothly, it's ok. However, one day you'll case a jump, and it'll let go.
You can buy the same rim and relace the spokes and hub across, pretty straightforward. That's what I would do.
So today was riding and noticed a BIG crack in my rim. Back rim, goes the whole width of the rim, the rim is a sunringle equilizer 31.
Just wondering if anyone knows how long I could ride with it until it snaps, etc.
Pics of the crack
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Thanks guys! any comments are welcome
It is indeed opposite the valve hole! So it looks like a crack in the weld.Nick,
Is that "crack" opposite the valve hole as it looks like the rim joint. If this is the case, the rim should be right as it just looks like the rim bead at the joint is just misaligned. Try taking the tyre off and displacing the rim joint alignment, if you can't slide the 2 mating surfaces against one another then the sleeve or pins (the structural elements in a non-welded rim joint) are still fine and the rim is still good. If your still concerned, err on the side of safety and replace the rim particularly if you ride the bike hard. MTX 31's are relatively cheap compared to breaking yourself.
Edit: What T-Rex said, who said reading all posts is over-rated, doh!!!!
It's not a crack in the weld, because there isn't a weld to crack. :wink:. It's a pinned joint, and it's not at all unusual for the join to be visible like that. Even a slight misalignment of the ends of the rim section isn't all that unusual, especially on wheels that do cop a bit of a hiding. You can squeeze the sidewalls of the rim carefully with multigrips to smooth out the joint (the pins are deeper in the rim, inside the "shoulders" that form the centre channel). If the joint isn't moving then it's fine.It is indeed opposite the valve hole! So it looks like a crack in the weld.
Im thinking of upgrading to mavic 721s or something along those lines! Thanks for your help
I think it will last until the precise moment you stop thinking about the fact that it might break and let your guard down, at that point it will explode into three gazillion pieces at least 12 of which will embed in your skull.The guy's asking a serious question, and your answer is just fucking stupid.
It's got atleast 32 mins. left in it. And that's ride time.