Respacing and undishing a 26" MTB wheel
09-09-14, 01:11 PM
#1
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Respacing and undishing a 26" MTB wheel
In searching, I've seen a couple threads somewhat related to my question here, but no definitive answer as far as I was able to see. I'm planning to convert an old Takara 15-speed mountain bike to fixed gear to use this winter. I'd like to use the old wheel. I think it's not really worth proceeding with the project if I have to buy a new rear wheel. Trying to build a cheap, simple winter beater. Don't want to invest a lot in parts.
My plan was to get some spacers to move the cog out as far from the flange as possible, respace the axle and use the chainring in the middle position on the spider to try to get the chainline straight and then take some dish out of the wheel to get the rim centered. I believe the rear is spaced 126mm. Haven't measured the front chainline yet. It's got a suntour 5-speed freewheel. I'm wondering how likely it is that I'll have enough adjustment available in the spokes to get the rim centered. Has anyone here done this successfully? Thanks.
My plan was to get some spacers to move the cog out as far from the flange as possible, respace the axle and use the chainring in the middle position on the spider to try to get the chainline straight and then take some dish out of the wheel to get the rim centered. I believe the rear is spaced 126mm. Haven't measured the front chainline yet. It's got a suntour 5-speed freewheel. I'm wondering how likely it is that I'll have enough adjustment available in the spokes to get the rim centered. Has anyone here done this successfully? Thanks.
09-09-14, 02:31 PM
#3
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Definitely. I'm not going to mess with the dish until I absolutely have to. It just seems likely that I will... at least a little. I'm on my way to the bike shop now to pick up some stuff. I guess I'll know soon if it's going to work.
09-10-14, 03:30 AM
#4
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take the freewheel off and thread on a fixed or a freewheel cog and undish the wheel, would look nicer than a sloppy freewheel there
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09-10-14, 05:33 AM
#5
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Sorry if it wasn't clear. I'm making a fixed gear. I'm trying the "suicide" fixed gear rear wheel with a fixed cog held on by a BB lockring and some loctite. Was wondering how likely it is that I'll have enough adjustment in the spokes to make the wheel symmetrical since it was made to be dished... It has shorter spokes on the drive side.
09-10-14, 06:01 AM
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In my opinion, don't bother undishing the wheel. Just space the cog out far enough that it works, if you want a symmetrical wheel (not that important in the grand scheme of things) it'd be better to relace the wheel with same length per-side spokes and a hub that accepts a lock-ring. Embrace the kludge
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