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why does the rear wheel wobble??!(7 posts)

why does the rear wheel wobble??!Maverick
Oct 16, 2001 8:02 PM
i ride an old Trek 2300 (with carb tubes and alu lugs), and when i hammer hard, the rear wheel wobbles like mad. anyone knows what causes this?? i ride with a Mavic Cosmos and i don't think it's the wheels which causes this.
re: why does the rear wheel wobble??!MrCelloBoy
Oct 16, 2001 10:12 PM
1.) Frame lugs loosening at stays.
2.) Weak seatstays.
3.) Both of the above.
4.) Loose bearings in rear wheel
5.) Low spoke tension in rear wheel
6.) Low tire pressure
7.) Earthquakes.
8.) I give up.
one more for the list..dotkaye
Oct 17, 2001 9:36 AM
I had wheel wobble recently, it was none of the things on the list.. the freehub bolt had worked loose. Tightened it up with a 10mm allen key, wobble gone. If there is no lateral play in the axles, and no vertical play on the non-drive side, but there is play on the drive side, then suspect this..
Have you?Stattoman
Oct 17, 2001 2:17 AM
Checked the wheel for alignment in the stays (measure for centre at the crank end of the stays)? Checked to see if the skewers are moving around a tad and letting the wheel oscilate (put a dab of grease on the outside over the skewer end and only to drop-outs (not under obviously) and see if there are tell-tale signs of movement at the end of the ride.
Check your frameDave Hickey
Oct 17, 2001 2:59 AM
Make sure your seat/chain stays haven't come unglued from the lugs.
Spoke Tensiongrzy
Oct 17, 2001 9:55 AM
Chances are your wheels are hammered. They may be true and round, but that's a static no-load condition. It's highly likely that your spoke tension is all over the map to keep the wheel true and when you hammer away the rim gets pulled out of true with the result that the whole bike shakes. A simple test would be to slap on a set of new crispy wheels and see if there is a difference. You could also have a dynamically unballanced condition due to being out of round or added weight in terms of lots of tube patches or a heavy spoke magnet if you use a computer. It's alos a real possibility that your hubs are shot (or just out of adjustment) or that your frame is tweaked or your headset is loose, but one should check the more likely and simple things first. It's sort of human nature to jump to conclusions and start thinking of the more complex and less likely failures when in reality the cause is quite simple. Until you've seen it it's hard to appreciate how much influence the wheels have and why a good set of hand builts are worth the extra money.
Listen to GRZYguido
Oct 17, 2001 11:49 AM
Rear wheels can get "soft" from hard riding. You need to evenly tension all the spokes, so that they all make the same distinct tone when plucked (freehweel side all a higher note, as they are shorter). A nice tight, round, true wheel makes all the difference!