Edit..Rear Mac-9sp-135mm Drop Outs?

[waynebergman]

EDIT........ My friends bike is actually 135mm between the drop outs. We are thinking of installing a mac 10t rear hub on this bike. His bike has a nine speed on it and he would like to keep his shifter and chain so it would be nice to order the 9 speed free wheel at the time of purchase. What I am not sure about is I understand the 9 speed free wheel is 4mm wider than the 8 speed and cellman says you need a spacer.A couple of questions I am unclear on.....
1. Does this mean you have to flex the chain stays wider than the 135 stock spacing to fit the axle, free wheel and the spacer?

2.I am assuming the spacer is so the smallest of the cog set does not rub on the chain stay, is this correct?

2. My friends bike has a very sturdy chain stay assembly and it will not flex at all to open up wider than the 135mm so we may need to go with a stock 8 speed or seven but then this means a new trigger shifter if he goes the 8 speed route.

3.Has anyone used a nine speed with a 135mm spacing and how did it go?

 

[Haohmaru]

Bump.

I am also curious how the spacer works to accommodate more than 7 speed freewheel. Does it just stretch the drop-out distance of the frame? Anyone with positive or negative experiences doing this? Thanks in advance for the feedback.

 

[cal3thousand]

I imagine that it spreads the dropouts a tad and gives the top gear some space from the dropout. Otherwise, your chain might rub. Of course, you'll run a 9 speed chain that is narrower too...

 

[999zip999]

A steel comoly frame ? It's best for an ebike.

 

[waynebergman]

I have found out that yes the chain stays need to flex out 4mm in total for the 9 speed to work. My friends bike is too stiff so we will go with an 8 speed and just change out the trigger shifter for an 8 speed compatible and also compatible chain. Seems like more of a sure thing going this route.