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Dropouts(3 posts)

Dec 10, 2001 6:33 AM
I have a old touring bike that I use for commuting that I'd like to upgrade the wheels on but am concerned about the dropouts? What is the correct dimension of the front and rear dropouts of a "new" roadbike?
re: Dropoutszelig
Dec 10, 2001 8:43 AM
Standard road bike front dimension is 100mm. For the rear, most road racing bikes are 130mm which when using a freehub will take 8-10 cog cassettes. I guess some would call that standard, 100m front and 130mm rear. Prior to that, the 6 & 7-narrow speed era, the width was 126mm and prior to that in the 5 spd era it was 120mm.
If it's a steel frameStraightblock
Dec 10, 2001 2:29 PM
you can spread or "cold set" the rear triangle for a wider hub. I've done it successfully at home with no special equipment, but you're better off leaving it to someone who can check the alignment as they do it.

If you're upgrading to a wheelset with more cogs, you'll need to replace more than just the rear wheel & cassette or freewheel. Rear derailler, shifters, chain, and possibly the small chainring may all need replacing.

How good is the frame? If it's not a pretty decent frame, it may not be worth investing in upgrades anyway. Just put better tires on it & keep it in good repair, especially if you've got a short commute.