|   Can I swap RhynoLite XL for a Mavic f519 w/o changing spokes | Obie1
Jan 9, 2004 11:50 AM | | Hi, I bought a new rear wheel off ebay that has a RhynoLite XL with the black anodized braking surface. But because I run a magura HS33 rim brake on the rear I need the braking surface. So I was thinking of either using easy off oven cleaner to get rid of the anodizing, but that seems like more trouble than it's worth. My other thought is getting a another RhynoLite with the silver braking surface which will be an easy side-by-side swap. But I would rather get a Mavic f519 to save 105grams which is pretty significant at the wheel.
I checked a spoke calculator and these are the lengths it came up with.
Hub: SunRingle Abbah XC
Pattern: 3x
Rim: RhynoLite XL (565g) L - 263.0 R - 261.6
Rim: Mavic f519 (460g) L - 263.5 R - 261.1
With spoke lengths, do you round up, or does it not matter when dealing with .5mm? Is it possible to swap the rims without changing the spokes? Any advice is appreciated.
Thanks,
Jay |
| Seems likely | seb at work
Jan 9, 2004 1:16 PM | | Since they are both within .5mm, you have a good chance of sucess. The best way to know for sure would be to lift up the rim strip (if any) on your current wheel and look at where the spokes come through the nipples into the rim. If they go all the way through the nipple and maybe aout a bit, youlve got plenty of extra spoke for the left side, but maybe to much for the right side. If they don't even come all the way up to the bit in the nipple where it is slotted, you probably don't have enough for the left side, but would be OK on the right. If both sets are in between those two extremes, you should be good to go.
It does seem odd that the new rim would require longer spokes on the left (indicating a larger ERD) and shorter on the right (indicating a smaller ERD). The only way that makes sense is if the new rim is assymetric, which the F519 is not. Are you sure your math is right?
In any case, yes, you CAN switsh rims without changing spokes. You don;t even remove them from the hub- just tape the two rims together with the valve holes lined up, loosen all the spokes fully, and swap them over one set at a time.
All you really need to worry about is the ERD of the two rims (and whther one is assymetric, which I don't think yours are). If the ERd's match closely (say within 2 or so) you are probably good to go, assumeing your spokes aren't already a bit short and the new ERD a bit bigger, or vice versa. I've done two rims swaps where the new rim was different from the old, and I never even bothered calculating the required spoke lenghts, just bought a suitable ERD rim and gave it a go. Both turned out swell. |
| I used Damon Rinard's excel spoke calculator | Obie1
Jan 9, 2004 1:36 PM | | So it's not my math. According to his specs, the 519 has an ERD of 543.0 and the RhynoLite XL is 544.0. Just wasn't sure the 1mm difference had an impact. I'll take a look at the wheel when I get it.
http://www.damonrinard.com/spocalc.htm |
| I used Damon Rinard's excel spoke calculator | seb at work
Jan 10, 2004 8:20 AM | | I used the same calculator, and it looks like you just mis-typed the left length for the f519, which should be 262.5mm, not 263.5mm. So yeah, the ERD is 1mm smaller and your spokes all need to be .5mm shorter, just what you would expect. Nothing funny going on.
I think the only reason you'd have any problem is if the nipples bottom out from taking up an extra .5mm of thread, or if the actual manufactured ERD's are more different than the "spec" erd's would make you believe. |
| You're right, I wrote it down wrong. Thanks for the help. [nm] | Obie1
Jan 14, 2004 9:53 AM | | |
| If you're very lucky, yes. | Dougal
Jan 10, 2004 2:31 AM | | I had some DS1-xc's which had the same ERD as rhyno lites (544mm I measured them at).
A few weeks ago I replaced one with a mavic 519 (537mm ERD measured in the same was as the rhyno), that's a 7mm difference in ERD.
The spokes pulled right up but tensioned ok. It must have been within about 1mm of bottoming the nipples on the spokes. If your spokes are a little too long you may not be able to make it work.
Dougal.co.nz |
| The ERD of a Mavic f519 is really 537mm? | Obie1
Jan 14, 2004 9:52 AM | | I realize that manufacturers don't always have the correct posted specs, but it's stupid Mavic can't get their measurement even close. I mean, 6mm is a huge difference with wheels.
Just curious, did you take multiple measurement around the rim and average them? |
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