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Old 07-22-11, 04:32 PM   #1
Huzzah81
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Replaced Wheel Question/Issue

I just had my back wheel replaced after it broke a spoke less than a month after I picked up my '10 Specialized Crosstrail (1 broke at the hub, 1 while LBS was trueing the wheel after replacing the first spoke). The mechanic thought there might have been an issue with the original hub or wheel that caused the first spoke to break under weight and the second under tension but no weight, so they replaced it with a new double-wall wheel.

The double-wall rim size & quality have me a little confused & concerned...
It's a Weinmann ZAC19 700C x 28c/38c, with the original 700c x 45m wheel on it.
First: Is it an issue that these rims list 28/38 but the tires are 45mm?

Second: From what I'm reading, though they got me a double-wall wheel instead of the original single-wall, this is a cheap & low quality double-wall wheel... is it really any better than what I had? Do you think I have any reason/grounds to be concerned with their choice of replacement? (The bike came with Alex Z-1000 single walls... I assumed they were replacing them with the Alex double-walls that come on the 2010 Crosstrails. ***edit- the Alex double-walls on the 2011 are 32 hole... being 6'6" 250lb. I suppose 36 spokes are helpful... again, I know very little about bike components so I'm not sure how big a difference the different rims, hubs, spoke counts, etc. mean***)

Thanks again!

Last edited by Huzzah81; 07-22-11 at 04:43 PM.
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Old 07-22-11, 09:24 PM   #2
AlphaDogg
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I don't really know much about double walls, but I do [strike]know[/strike] think that any double wall is better than a single wall. Did they just relace a new rim to the old hub? There is no issue with using 45c tires on 28/38c rims, AFAIK.

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Old 07-26-11, 11:29 AM   #3
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The alexrims on the Crosstrail sport are 19mm internally (I think 24 externall), and they fit the 700x45 tires just fine.

Also, the double walled 32h alexrims aren't all that anyhow. I'm a clyde too and breaking spokes on them... You're pry better off with the 36h.
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Old 07-28-11, 03:03 PM   #4
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replaced wheel question/issue

Well I finally got a hold of my buddy the wheel building guru and he said make sure they tension the spokes to 130 kilograms. That should help on not having any other spokes break.

wbill
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Old 07-29-11, 10:38 PM   #5
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Update: I changed out my standard issue Crosstrail for a Crosstrail Sport... The gearing, components, and lockout were more than enough to make me do the trade for some extra cash.

The spokes on the new bike definitely seem tensioned much higher, though I have no idea how much... Of course, not having any relevant experience myself and seeing/reading so many posts/articles about spoke count, weight, and all that I'm a bit worried about having gone from 36 spokes down to 32.
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Old 07-31-11, 07:36 AM   #6
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replaced wheel question/issue

I would get it back into the shop and have them check the tension on the rear wheel at least just to be safe.

wbill
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Old 07-31-11, 09:08 AM   #7
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Congrats on the new upgraded bike!

32 spokes is plenty. Don't worry about it.

I've never had my spoke tension measured. I don't believe it's necessary, but I suppose it wouldn't hurt.

Check for loose spokes regularly and spin the wheels to check that the rims remain true (straight).

Get a spoke wrench (a truing stand is very helpful but not absolutely necessary) to make any necessary adjustments to spoke tension (tighten up loose ones and/or tighten/loosen spokes as needed to true the wheel) or take to the shop and let them do it.

Last edited by qmsdc15; 07-31-11 at 09:16 AM.
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