Woofie Posted July 20, 2009 Posted July 20, 2009 I have a set of Rolf Dolomite MTB rims. I think some of the spokes on the rear wheel were overtightened and over time the rim has started showing hairline cracks around two of the nipples. Is there anyway to fix this? I have looked at getting a replacement 20 spoke V brake rim but I havent found anything at all. Anyone?
Captain Slow Posted July 20, 2009 Posted July 20, 2009 Use Johnson & Johnson's Nipple Cream!! Apply twice a day and you are sorted!!
Racer X Posted July 20, 2009 Posted July 20, 2009 Johan better come and comment, personally If I had a hairline crack in a rim I would retire it. Best post a pic so we can see the extent of the damage.
Woofie Posted July 20, 2009 Author Posted July 20, 2009 Use Johnson & Johnson's Nipple Cream!!Apply twice a day and you are sorted!! You guys are worrying me now! If you arent breastfeeding you shouldnt know what to do! I will try and take some pics later on. Otherwise - anybody want to buy a wheelset?
AndreZA Posted July 20, 2009 Posted July 20, 2009 JB is gonna tell you to toss the rims and have them rebuild with new ones.
Mackie Posted July 20, 2009 Posted July 20, 2009 Do you know a good wheelbuilder for Woofie?Toss the rims and rebuild with new ones.
Johan Bornman Posted July 20, 2009 Posted July 20, 2009 I have a set of Rolf Dolomite MTB rims. I think some of the spokes on the rear wheel were overtightened and over time the rim has started showing hairline cracks around two of the nipples. Is there anyway to fix this? I have looked at getting a replacement 20 spoke V brake rim but I havent found anything at all. Anyone? You are about to discover the joys of standard wheels using standard rims, spokes and nipples, built on Shimano SLX or XT hubs. Your Dolomite/Shlolomites are behind you, look forward. You won't find 20-hole MTB V-brake rims anywhere, and if you do, you'll have to change the spokes to accommodate the new rims. It's not worth it. Bite the bullet and have yourself a set of standard wheels made up that can be fixed by anyone, in any province, using freely-available parts.
Johan Bornman Posted July 20, 2009 Posted July 20, 2009 Oh, and finally, the nipples didn't crack, the rim cracked. The rim cracked not because it was tensioned too much, but because it was made from a material too weak for the job. A 20-spoke wheel needs to be highly-tensioned in order to stay true and paired with a crappy, anodised rim, you have a recipe for wheels that live as long as a mayfly. The rims cracked from metal fatigue - if a few nipples were too tight, the wheel would not have been true. The nipples were therefore all of equal tension. With a 32-spoke wheel you have (32-20)/20 times less cyclical fatigue. In other words, all things being equal, a 32-spoke wheel will last .6 times longer than a 20-spoke wheel. In practice it is much more than that since the overlay of static force (spoke tension) on top of cyclical tension (as the wheel rolls), fatigues the rims more than the 0.6 advantage. The short version: toss the rims and start over.
Woofie Posted July 20, 2009 Author Posted July 20, 2009 Thanks I do have a second set of rims, but the rolfs were super duper light! Would anyone still want the hubs for anything?
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