Well, I managed to hit a nastry pothole on the way to work yesterday that caused a flat spot in my rear rim I trued the wheel, but the flat spot is there to stay and noticible as that nice quiet spin i used to have is gone. So... if I purchase a new rim, can I re-use the existing spokes & nipples, or do I need to buy new ones?? It's a fixed gear wheel, and I have never done this before. I think I'm fairily mechanically competent, so I think with some study, I hopefully can pull it off. Any tips would be appreciated as well!!
if you buy the same rim you should be ok. If you get a different rim you may need new spokes. You need to really look at the hub when you take it apart too to make sure that it is structurally sound and that there isn't a lot of spoke wear. Building wheels is not hard, but you do need some tools to do it right. The easiest thing to do would be to buy an identical rim and tape it to the side of the wheel you are repairing(lining up all holes). Then just move each spoke over 1 at a time. I highly recommend taking the whole thing apart and building from scratch though as it is good practice and if you are mechanically inclined you will enjoy it. Either way make sure you have good spoke tension when you are done. You will have to true it after the first few rides until it settles in. Good luck.
Well, I managed to hit a nastry pothole on the way to work yesterday that caused a flat spot in my rear rim I trued the wheel, but the flat spot is there to stay and noticible as that nice quiet spin i used to have is gone. So... if I purchase a new rim, can I re-use the existing spokes & nipples, or do I need to buy new ones?? It's a fixed gear wheel, and I have never done this before. I think I'm fairily mechanically competent, so I think with some study, I hopefully can pull it off. Any tips would be appreciated as well!!
If the wheel is relatively new i'd reuse the spokes. If they've been heavily used i'd replace them all.
Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.
The easiest thing to do would be to buy an identical rim and tape it to the side of the wheel you are repairing(lining up all holes). Then just move each spoke over 1 at a time.
+1 use the same spokes as long as you haven't previously had spoke failures. Hopefully you bought the same rim.
I've had perfectly good results even using old spokes as long as the nipples screw off cleanly. I commuted for about 3 to 4 years on a set before the rim brakes wore down the rear rim that I could not tolerate the grabiness of the brakes. Fourtunetly I'd used a thinned down grease for the spoke thread prep and it had survived and both the nipples and spokes were fine to re-use on the new rim replacement. If you run into some seized spokes that you finally have to cut but the others come off fine then just replace the ones you had to cut along with any that felt really dodgy. If they ALL came off only with a lot of trouble or you had to cut away a lot of them then replace them all.
And yes, this assumes you replace the rim with the identical or similar ERD rim.
Not to hijack the thread, but I also recently hit a pothole. Rather than flat spot on the rim, the impact caused cracks in the rim (Open Pro 36h) around two spoke holes (two cracked holes are directly opposite eachother across the diameter of the rim). I had thought these types of cracks resulted from too much tension rather than impact but they appeared immediately after the impact -- perhaps a combination of factors caused damage? (wheel built by online custom build site so I never checked the spoke tension myself).
I plan to also rebuild with the same hub and spokes -- replacing the two spokes threaded into the damaged spoke holes -- unless I find some other indication of damage to the hub once I start disassembling the current wheel.
Not to hijack the thread, but I also recently hit a pothole. Rather than flat spot on the rim, the impact caused cracks in the rim (Open Pro 36h) around two spoke holes (two cracked holes are directly opposite eachother across the diameter of the rim). I had thought these types of cracks resulted from too much tension rather than impact but they appeared immediately after the impact -- perhaps a combination of factors caused damage? (wheel built by online custom build site so I never checked the spoke tension myself).
I plan to also rebuild with the same hub and spokes -- replacing the two spokes threaded into the damaged spoke holes -- unless I find some other indication of damage to the hub once I start disassembling the current wheel.
I don't think the cracks are due to tension and it's probably coincidence that you hit a pothole and noticed them. I've replaced a lot of OP rims with these same cracks and they are from fatigue. I'd bet the spokes where your rim cracked are fine as well. But it wouldn't hurt to replace them just to be safe.
The spokes can be reused almost forever if they arenot kinked. You will need the same rim or one with the same ERD. Tape the rims together and remove one spoke at a time and place it in the new rim. Get a few new nipples to replace those that are damaged in the process.
Just a followup on this... The rim with the flat spot is a Mavic CXP22. I'd like to replace possible with a Mavic OP. How do I determine if these have the same ERD?? I presume the OP's are more durable than the CXP22??
The spokes can be reused almost forever if they arenot kinked.
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Originally Posted by RGW
Just a followup on this... The rim with the flat spot is a Mavic CXP22. I'd like to replace possible with a Mavic OP. How do I determine if these have the same ERD?? I presume the OP's are more durable than the CXP22??
They don't have the same ERD. CXP 22's are 598.5 and Open Pro's are 605 (according to spokecalc). I always check several references (or measure) before settling on a number. Look for a rim in the neighborhood of 598-599 and you should be fine. CXP33's apepar to have the same ERD as the 22's and will be stronger than the Open Pro.
I trued the wheel, but the flat spot is there to stay and noticible as that nice quiet spin i used to have is gone. So... if I purchase a new rim, can I re-use the existing spokes & nipples, or do I need to buy new ones?? It's a fixed gear wheel, and I have never done this before. I think I'm fairily mechanically competent, so I think with some study, I hopefully can pull it off. Any tips would be appreciated as well!!
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Originally Posted by RGW
