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Old 06-10-12, 01:59 AM   #1
GaryinLA
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Replace sun rim with what?

HI I have a 1998 Jamis Aurora which is a touring frame I believe (has rack mounts front and back) and is a 21 speed with 7 speed RSX components. It is all stock and relatively low mileage. A forum member told me the wheels are : 36H Sun CR-18, 14G straight gauge spokes, and the hubs I see are Shimano RSX.

When I got the bike close to a year ago the rear wheel was not true. My trusty mechanic trued it, and then immediately when i rode it again it got untrue again. He gave it another shot and it has stayed true. I've put maybe 600 miles on the bike since then (I have some other bikes). No problems with the wheels up to today.

I have new Panaracer Pasela Tourguard 32cm tires on the bike and I really like them. Before then i had cheap CST Czar 25mm and I had to stop using the tires because i was getting flats.

I weigh 180. I often carry as much as 12lbs (bag and contents) in a messenger bag (laptop). I plan on getting racks on this bike and using it as a commuter and maybe 1 night bike camping eventually etc.

Today I had an unfortunate incident with a curb and all the weight of the bike and me landed on the rear wheel. No damage at all to the bike or the front wheel. The rear rim is out of true. I suspect my mechanic will tell me he can't fix it by adjusting spoke tension or whatever else he can do to true a wheel or doesnt recommend trying to fix it (but i could be wrong).

My question is- assuming the rim is now bad, and considering my intended use of the bike, and the front wheel (which is in good condition), and the rear wheel RSX hub is in good condition, what should i do now re the rear wheel? Should i have my mechanic relace the hub to a new rim?
What would be a good choice of rim?

Should i get a new or new used wheel because maybe it is more cost efficient or maybe i should take the oppty to get a better or different hub? (I dont know anything about wheels or hubs or rims.)

I see a lot of used Alex wheels for sale on craigslist etc. Some are used, some are new condition but takeoffs. I also see online that Alex wheels dont get good reviews generally, so I am thinking i should pass on all the deals for Alex wheels I come across. (I was offered a used good condition Alex wheelset today for $80 by someone selling them on a street with other used goods. 3 weeks ago my mechanic had a pair of new Alex wheel takeoffs from a Specialized Alleze for $200.)

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Old 06-10-12, 02:33 AM   #2
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If you move to a new (different) rim you may need new spokes if the ERD of the rim is different.

I think you can get a new CR-18 rim for about $35. You can try to do the replacement yourself if you're somewhat ambitious (I was able to do this with nothing more than grease, an electric screwdriver, and a spoke wrench, but ymmv) or pay a mechanic not a whole lot to do it for you. If you elect to do it yourself this is the cheapest option, I doubt you can get a quality wheel for $35. OTOH if you're having a mechanic replace it for you, this could cost as much as a new wheel. Then again, a new wheel will probably be machine-built and if your mechanic is good the quality of your hand-assembled wheel will be higher.

I would replace the rim, either myself or with a mechanic. That's just my opinion though.
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Old 06-10-12, 02:51 AM   #3
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Labor to build a single wheel is about $40-50 at the shops around here. Plus another Sun CR-18 rim. Reuse spokes, nipples, hub, tape, tire. That's what I'd do, if he can't true the existing rim.

I would not buy a cheap pre-built wheel because then front and rear hubs and rims won't match (which would bug me, and hurt bike's value), and a hand built wheel will be better.
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Old 06-10-12, 06:28 PM   #4
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Labor to build a single wheel is about $40-50 at the shops around here. Plus another Sun CR-18 rim. Reuse spokes, nipples, hub, tape, tire. That's what I'd do, if he can't true the existing rim.

I would not buy a cheap pre-built wheel because then front and rear hubs and rims won't match (which would bug me, and hurt bike's value), and a hand built wheel will be better.
Not many shops are going to want to rebuild using the same spokes. that makes a boxed wheel more attractive, at least financially. Of course, a hand built wheel gives more chances to spend money, like hey, lets get 10 speed brifters, since we have to change the hub....
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Old 06-10-12, 10:33 PM   #5
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A hand rebuild with another of the same , sun rim will be fine.
If better maintained.. just keep up tensioning and truing ..
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Old 06-10-12, 10:39 PM   #6
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Thanks for the replies i will see what my mechanic says. Meanwhile i switched to one of my old other road bikes and the back wheel went untrue and that wheel was in good repair before too, and didn't have any incidents with curbs today either. (I have one more old road bike in top repair in my garage I can damage next.) Each day i road about 48 miles so i am content with MY performance and just figure these wheel things just are a cost of riding. My friend who commuted for years on an old road bike told me he's had lots of wheels go out of true, sometimes he got new used wheels or had the wheels rebuilt etc but he still had problems with wheels going out of true from time to time. He's probably 20-30 pounds heaver than me though and he has these big batteries mounted for his light system.
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Old 06-11-12, 12:30 AM   #7
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IF the spokes are properly, evenly tensioned, wheels just don't go out of true barring severe abuse
Chances are the spokes should all be loosened and the wheel laced back up from scratch.

I have a hunch your "trusty mechanic" is just tightening spokes to get the wheel straight without regards to proper tension.
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Old 06-11-12, 10:43 AM   #8
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The CR18 is a pretty stout rim; I've been pounding on a pair of them for about 20,000 miles with my weight ranging from 265 to my current 210-ish, and I carry commuting gear upwards of 25 pounds depending on the day.
Unless you really pranged that rim and put a dent or blip in the bead, I can't imagine that it is far enough out of true that it is unfixable. I also ride Pasela TG 32mm tires, and they offer a fair amount of cushioning against rim damage. If you didn't end up with a pinch flat, you probably didn't clang up the rim to an unusable state.
Sounds like Bill is correct in stating that your mechanic is just turning spokes until the wheel is straight, without regards to proper balanced tension, and a slight jarring is enough to pull the whole thing back out of whack. The wheel needs to be brought down to zero tension and trued/tensioned from scratch.
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Old 06-12-12, 12:59 AM   #9
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Thanks for the comments. I will take both untrue wheels into my mechanic when i have the chance and ride my 3rd road bike that's still in good repair. I will ask him to take the time to do what is suggested above. My friend who has a lot of commuting experience said eventually he turned to a friend who has some sort of spoke tension measuring device and works with him to adjust his spokes. My mechanic may not be taking that sort of approach and these bikes started out used before we got started with them. I cant switch the wheels from bike to bike because all 3 bikes are differnet setups. One bike has 700 wheels with 32mm tires. The 2nd one has 700 wheels with 25mm tires and wouldnt fit 32. The 3rd one is 27" with 1.25".
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Old 06-12-12, 07:23 AM   #10
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Originally Posted by GaryinLA View Post
Thanks for the comments. I will take both untrue wheels into my mechanic when i have the chance and ride my 3rd road bike that's still in good repair. I will ask him to take the time to do what is suggested above. My friend who has a lot of commuting experience said eventually he turned to a friend who has some sort of spoke tension measuring device and works with him to adjust his spokes.".
I bought a tension meter a few months back and it was quite enlightening.
Trying to tension old used spokes with corroded nipples by judging how hard it is to turn the spoke wrench DOES NOT WORK!
I had spokes that were rounding off the nipples that had about 1/2 the recommend tension.
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Old 06-12-12, 08:07 AM   #11
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If you do decide you just want to replace your wheelset, I can attest that this set from BWW is pretty bomb-proof: http://www.bicyclewheelwarehouse.com...s/prod_28.html

I put a pair on my commuter a couple years and a few thousand miles ago. I regularly load my panniers down and I'm no lightweight person myself. The wheels are still perfectly true and I haven't babied them.
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Old 06-13-12, 04:24 PM   #12
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Are these sun rims i have comparable to Mavix cpx22? If I need new rims is one of these better than the other, or a better deal? I can probably tell my mechanic to get me whatever rim i want if i need to have a wheel rebuilt.
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