Mag Wheels a Bad Idea? - Sportbike Forum: Sportbike Motorcycle Forums
 
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post #1 of 8 (permalink) Old 09-25-2002, 02:00 PM Thread Starter
 
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Mag Wheels a Bad Idea?

Has anyone heard of any kind of problems with the sprocket or rotor threads on a mag wheel? I remember a guy with a FZR1000 told me that he couldent keep the bolts tight on his sprocket, and her ruined two swingarms cause the bolts ground out a piece of the swingarm. He advised me to forget about mags. He also told me that he tried every kind of locktite there is.

Anyone know?

I have not read a word in this forum about this, if im double posting then its proof im an idiot.
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post #2 of 8 (permalink) Old 09-26-2002, 02:53 AM
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don't worry, many topics get repeated over and over again, but i don't think this is one of them.

my friend has mag spoked/carbon fiber rimmed dymags. they are nice. they're lighter than the stock oz rims on his mille (which are lighter than many a/f rims). he has no problem keeping his sprocket on. there was a guy with pm's this way who never had a problem either.

however, mags (especially used on the street) do require care. they should be x-rayed during the non-riding season for cracks. i also hear they start to look like crap after a couple of years.

have you looked into hi-point. al is more durable.

btw, the problem your friend may have had is that most don't have cush drives (more offer now as an option) and the sprockets are mounted solid to the wheel. it can be hard on trannies, so i would avoid on the fj.

Tony

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Last edited by FZR400Tony; 09-26-2002 at 03:18 AM.
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post #3 of 8 (permalink) Old 09-26-2002, 03:13 AM
 
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i don't know how helpful this will be. i just thought it strange mentioned someones rear sprocket comming off.. my front one just did the same!!! rear is still there tho.. i'm thankful it just scored the cover and didn't crack the case! like i said probably not much help..
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post #4 of 8 (permalink) Old 09-26-2002, 12:50 PM Thread Starter
 
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Ya I can see how a rim with no cush drive might be more prone to breakages, I never thought of that! Thank you FZR400Tony! Who knows the dude I talked to might have used the wrong bolts or something, cause from the responses here, no one has had that problem. Wheew.
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post #5 of 8 (permalink) Old 09-26-2002, 02:18 PM
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I mentioned in a previous post some time ago about torquing nuts and bolts correctly. If they are not uniformly torqued, when you're all done, some will be tighter than others. The loose ones will eventually unscrew themselves.

Weird about the loc-tite, tho. Perhaps Tony's on top of this one.
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post #6 of 8 (permalink) Old 09-27-2002, 02:50 AM
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actually, i would think you're right about the torquing the sprockets down correctly.

i don't always have time to grab a torque wrench, but you really do need to torque things like that down evenly and correctly. i know even doing a star-like pattern, i still find that the first ones done are usually a bit loose.

Tony

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post #7 of 8 (permalink) Old 10-04-2002, 05:38 AM
 
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Mag wheels get used by quite a few race teams. As mentioned, proper torqueing is key to holding the sprockets but also for taking care of the wheels. Slight over torqueing will ruin the threads then it is time to repair. Racing wheels have the sprockets changed out several times in a race weekend so obviously proper use will keep the wheels usable for a long time. We didn't safety wire the nuts during practice either... just for race time. We only had one bolt come loose on a sprocket over 4 AMA seasons and we aren't sure what happened(it was wired and the wire was mangled).
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post #8 of 8 (permalink) Old 10-04-2002, 10:00 AM
 
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I have been using a non cush drive hub on my PM race rims on the street for over 15,000 miles and 4 years with never a bolt coming loose. Also the bikes on my race team never had a problem with loose bolts and I did not use locktite since it made removal a pain under race conditions. The bike has 29,000 miles on it now with no trans problems even though I have heard non cush drives are hard on trannies. I don't believe any of the PM rims have cush drives on them, at least none of the ones I have used did.

I have Dymags and Marchasini rims on some other bikes now and they have not had any problems. Except a few years ago some of the Dymag cush drives did have a problem with the hub bolts inside coming loose, but Dymag warranted them and the new hub has not been not a problem since. The bike I had the problem with puts out 135 foot pounds of torque though so that may have contributed to the problem too... lol

I do run Locktite on the street and I would have to agree with using a torque wrench on ALL wheel bolts sprockets and especially rotors. Rotors can warp if all the bolts are not torqued evenly or work loose. No brakes is a bad thing...
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