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How big a freewheel can I use with old Shimano 105 derail(6 posts)

How big a freewheel can I use with old Shimano 105 derailgeoff
Aug 2, 2001 8:37 AM
I am replacing my freewheel on my old roadbike (a circa 1989 Rossin with Shimano 105 components). I ride a lot of steep hills and I was hoping to buy a large freewheel than I currently have - a 6 speed 13X21 I think. Does anyone know how big a freewhell I can put on. I was hoping I might be able to fit a 7 speed 13X32 but I don't know if I have enough clearance with the rear derailleur.

Thanks
it dependsRusty McNasty
Aug 2, 2001 9:12 AM
What size cage does it have??
it dependsgeoff
Aug 2, 2001 9:28 AM
The cage on the front derailleur is ~1.5cm wide and 5.5 cm tall. That's the size of the opening anyway. It is also Shimano 105 from ~1989.
re: How big a freewheel can I use with old Shimano 105 derailRusty Coggs
Aug 2, 2001 10:39 AM
Believe shimano max cog spec on the old 105 was 28 teeth. I have run a 30 tooth rear cog with one,but 32 might be a bit of a reach.
FWIW, I think it's 28, too (nm)Retro
Aug 2, 2001 1:43 PM
re: How big a freewheel can I use with old Shimano 105 derailjaybird
Aug 2, 2001 11:35 AM
I am running an early 90's 600ex on my commuter and I have a 12/27 and that is about the largest I can go. I dont think I can get a 30 on there. I have a 53/39 on the front. Check your small chainring, I would guess that it is a 42, if you change that to a 39 you can get pretty close in gearing to a 42x30/32.