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7spd freewheel to 8spd conversion?(3 posts)

7spd freewheel to 8spd conversion?CalgaryDave
May 9, 2001 10:39 PM
Hi,

I have an old tri-bike with a 7spd freewheel (not freehub) and 7spd Shimano 105 derailleur. I'd like to install STI shifter/brake levers and am wondering if I can go with 8spd (better quality and availability). If so, what do I need to purchase to make the conversion.
Thanks in advance for any help.

Dave
re: 7spd freewheel to 8spd conversion?zelig1
May 10, 2001 7:17 AM
Why not just go to 9 spd as the same amount of work and componentry are involved and 8 spd stuff is basically not in production.

First consideration is the rear dropout spacing. For 7 spds its 126mm and for 8/9 its 130mm. A lot of people just spread the rear triangle and insert the wheel but I would recommend having the stays spread by a frame builder who can also properly align the frame and the rear derailleur hanger, all assuming your frame is steel.

Regardless of 8 or 9, you need a new rear cassette hub, cassette, rear derailleur, STI levers and chain. Chainrings could be changed but not a necessity.

Good luck.
re: 7 speed dropout spacingSydnie
May 10, 2001 7:48 AM
Alot of the later 7 speeds had 130 mm spacing. Since his is 'old'(whatever that means) with a freewheel maybe it's 126,but one needs to check.