I have built a hybrid bike with striaght bars and downtube levers. I want to fit Shimano indexed thumbshifters however I have a double chainset with 36/46 rings and a 7 speed cassette - 13 to 26T. I am using road mechs.
The shifters I have seen are designed for a triple but I have been told that they will work with a double chainset but I would need to change the front mech to a triple one.
Has anyone tried this set up? Does anyone know for definite whether this will work? I don't really want to change the front mech if I don't have to!
Many thanks.
Fitting thumbshift gear levers
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MikewsMITH2
- Posts: 1805
- Joined: 19 Sep 2008, 10:25am
- Location: POOLE Dorset
Re: Fitting thumbshift gear levers
Double/Triple shifters are compatible. However road and MTB front mechs aren't . Thumbies are MTB, so you need a MTB front mech, which should work OK with 36/46 OK. However if your thumbies are switchable to friction mode, then you shouldn't have a problem as double front chainsets are by definition indexed.
S.O.S - Save Our Steel!
1971 Raleigh Mercury
2010 Condor Fratello
1980 Peugeot Tandem
1989 MBK Aventure MTB
195? Viking Severn Valley
1951 Raleigh Lenton Sports
See them here http://tinyurl.com/Mikewsmiths-Bikes
1971 Raleigh Mercury
2010 Condor Fratello
1980 Peugeot Tandem
1989 MBK Aventure MTB
195? Viking Severn Valley
1951 Raleigh Lenton Sports
See them here http://tinyurl.com/Mikewsmiths-Bikes
Re: Fitting thumbshift gear levers
I think when they said "you will have to change the front mech to a triple one", they really meant "to an MTB one"
Then just adjust the stops on the deraileur so it cant go into one of the positions.
As the MTB shifter pulls more cable than the road double needs, I would imagine that it would work but be hard on your thumb when pushing onto the outer ring and have a slack cable when on the inner ring, if you were to set it up to be "right" on the outer ring position.
Then just adjust the stops on the deraileur so it cant go into one of the positions.
As the MTB shifter pulls more cable than the road double needs, I would imagine that it would work but be hard on your thumb when pushing onto the outer ring and have a slack cable when on the inner ring, if you were to set it up to be "right" on the outer ring position.
Yma o Hyd