|Wheel not symetrical - gear side sticks out more than other.||surf|
Jan 9, 2002 8:24 AM
I have another question related to an earlier post for a bike i was looking at.
Originally i thought the frame was bent, but i had it checked and it's good. The problem i was having was getting the wheel lined up perfectly in-line with the front wheel. Instead the rear wheel would line up off-center to the left of the frame and front wheel.
What i found out was that the freewheel side sticks out way more than the other side. This makes the wheel positioned to the left.
Solutions - i thought about adding spacers on the non freewheel side or something like that (looks like it could use one when i compare to my other bikes), but i dont want to bend the chainstays. It's a Campy wheel with a 7 speed freewheel if that makes a difference. Still have not bought it (for my sister) but its a good deal on a used bike.
any ideas would be appreciated
|Could it be just normal "dish?"||Retro|
Jan 9, 2002 8:34 AM
|If you look closely at other geared bikes, you'll see that almost all rear wheels are assymetrical. Does the rim line up properly between the stays? Chain line OK, and does the thing shift? If so, I wouldn't worry about it. Easy to have a shop check it it, though, if you're still unsure.|
|normal dish is still centered. nm||mr_spin|
Jan 9, 2002 8:38 AM
|Couple of things to check.||nee Spoke Wrench|
Jan 9, 2002 9:09 AM
|First, I'd check the over locknut dimension of the hub. You'll need some kind of caliper to get between the spokes to measure accurately enough. Some 7-speeds have a 126 OLD and some are 130mm. See if it matches the distance between the frame dropouts. If the OLD is wrong, the cheapest and easiest way is to get a new axle set. That will have the right length axle and all of the appropriate spacers.
Next, check the wheel's dish. To do this accurately, you need a wheel dish gauge. The rim should be equal distance from the rim on both sides. If the wheel dish is wrong, and that's not too uncommon, the wheel can be redished. Just loosen the spokes on one side and tighten the spokes on the other side until the rim is moved the appropriate amount. Start at the valve hole and don't adjust more than 1/2 turn at a time.
|Wheel is not properly dished||BipedZed|
Jan 9, 2002 9:14 AM
|A properly dished wheel has the rim centered between the axle nuts (the part that contacts the drop outs). The wheel in question is not centered and needs to be properly dished by decreasing tension on the non-drive side spokes and increasing tension on the drive side to pull the rim to the right and center. Do not attempt to add spacers to the axle as that will put the entire frame out of alignment and will not correct the wheel. Any good wheel builder will be able to properly dish the wheel, but I would not buy the bike unless the rear wheel is fixed.|
|I THINK YOUR RIGHT||surf|
Jan 9, 2002 9:21 AM
|I just read a definition of "Dish". Apparently the wheel itself should not be symmetrical but actually flatter on the freewheel side to move the rim into position -- is this correct? This wheel is pretty symmetrical so maybe it just needs to be dished? What about the chainstays, or rear dropouts (i think they are called that), should they be symmetrical or are they sometimes off-center to help with wheel position?
thanks for all the help.
Jan 9, 2002 10:55 AM
|Your wheel is out of dish. On a properly dished wheel, the rim is equal distance from the left and right axle ends, and therefore centered between the left and right dropouts.
Get your LBS to dish this wheel and mount it. When you get home, you can check whether the rear and front wheels track in the same line by running a straight edge along both rims.
Sound like you've got a good ride!
|You'll flip for this||Kerry Irons|
Jan 9, 2002 5:49 PM
|Just take the rear wheel out, reverse it (cogs on the non-derailleur side) and check to see if it comes to the same place between the chain stays and seat stays. If it doesn't, then it is not properly dished. The rim must be centered between the outer lock nuts. Same for the front wheel. People have concluded that their frames were bent when in fact the front wheel was dished (it should not be) or the rear wheel was improperly dished. Sound familiar?|| |