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Old 04-22-10, 11:31 AM   #1
oboeguy
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Need a 406 rim suggestion

This is a crosspost from the Dahon forums as I haven't had a lot of bite on the "which rim to get" question. Here's the text:
Well, I now have another rear rim split down the middle. Any replacement ideas? At least the hardier Velocity wheel lasted longer the the skinnier one. I swear that I don't do any crazy stuff on the streets. Are 20" wheels not made for guys my size? (see other thread, I haven't changed much) Is it the constant hard accelerations from NYC commuting that stress the wheels? Potholes I dance around every day? Oy!
Original post is here with links to some of my previous trashed wheel threads. This new wheel would be my fifth rear folder wheel in less than five years of riding folders. What am I doing wrong?
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Old 04-22-10, 02:10 PM   #2
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for the rear?

Sun CR-18 in your choice of 28h, 32h and 36h laced to a hub of your choice. (I recommend shimano tiagra or 105 level)

triple wall, eyeleted rim.
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Old 04-22-10, 04:46 PM   #3
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Or a Sun Rhinolite, bombproof.
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Old 04-23-10, 06:20 AM   #4
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I ride the Rhinolites on my twenty. I also ride Alienation Delinquent rims http://www.ebikestop.com/alienation_...uot-RM9662.php on my tote-cycle. Never any problems.
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Old 04-23-10, 02:30 PM   #5
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Quote:
Originally Posted by oboeguy View Post
This new wheel would be my fifth rear folder wheel in less than five years of riding folders. What am I doing wrong?
Unless you are putting on tons of miles, you are going through rims very fast.

(1) What tires are you using? At what PSI?
(2) Approximately, what is your weight?
(3) Where are you getting your wheels?
(4) Where are you riding? ... curbs? ... jumps? ... bunny hops?

Unless you are doing something extreme or getting crappy wheels built, 32 hole double-wall rims with some wider tires at a moderate PSI should last for lots of miles, IMO.
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Old 04-23-10, 02:35 PM   #6
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Unless you are putting on tons of miles, you are going through rims very fast.
Quote:
(1) What tires are you using? At what PSI?
Marathon Racers ~60psi
Quote:
(2) Approximately, what is your weight?
~190lbs
Quote:
(3) Where are you getting your wheels?
Rims online, built by my local guy.
Quote:
(4) Where are you riding? ... curbs? ... jumps? ... bunny hops?
NYC. I don't do any crazy stuff.

Quote:
Unless you are doing something extreme or getting crappy wheels built, 32 hole double-wall rims with some wider tires at a moderate PSI should last for lots of miles, IMO.
28 hole, BTW. The tires are pretty wide and the PSI isn't too high, I think. Much lower and the ride starts to feel mushy.
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Old 04-23-10, 02:49 PM   #7
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Do you know how much tension he's putting on your spokes? I take it your rims are splitting at the spoke holes, which sounds like it might be due to excessive tension. If he's using a tensiometer make sure he's correcting the settings for the shorter spokes of a 20" wheel. Otherwise you should be getting better service from your rims and the eventual failure mode should be due to brake wear making the sidewalls too thin. I have a Sun CR-18 on my Bike Friday in the 451 size and have no complaints yet. But it only has about 15,000 miles on it so it's still early.
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Old 04-23-10, 03:08 PM   #8
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There is no way you should be going through wheels at that rate.
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Old 04-23-10, 03:10 PM   #9
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Quote:
Originally Posted by prathmann View Post
Do you know how much tension he's putting on your spokes? I take it your rims are splitting at the spoke holes, which sounds like it might be due to excessive tension. If he's using a tensiometer make sure he's correcting the settings for the shorter spokes of a 20" wheel. Otherwise you should be getting better service from your rims and the eventual failure mode should be due to brake wear making the sidewalls too thin. I have a Sun CR-18 on my Bike Friday in the 451 size and have no complaints yet. But it only has about 15,000 miles on it so it's still early.
there's no way you can fit a park tension meter in 20" wheels with the very short spoke lengths it uses.
DT swiss tension meter, I think you can squeeze that in there.
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Old 04-23-10, 07:50 PM   #10
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Quote:
Originally Posted by AEO View Post
there's no way you can fit a park tension meter in 20" wheels with the very short spoke lengths it uses.
DT swiss tension meter, I think you can squeeze that in there.
Incorrect statement, as I built a 406 wheel with a Sturmey Archer 8w (bigger flange than regular hubs) 2X and was able to use my park tension meter. It was a bit tight, but it worked.
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