god
Bike Kats,
Perhaps you can help me.
Summary Question:
I want to replace the 34 tooth cog on my Shimano megarange 11-34 freewheel with a smaller cog, like 26, or 28.
What's the best type of cog to do this with?
I haven't looked into the details of this other than studying Sheldon Brown's article on the this 11-34 freewheel which shows how to access the 34 tooth cog.
Desired Solutions:
1. Ideally there exists a (insert manufactures name here [i.e., Suntour]) cog that fits perfectly.
2. Less ideally, some minor Dremel tool machining of a cog that almost fits would make it fit nearly perfectly.
3. Even less ideal, major machining, cutting, welding, would be required.
I believe the correct answer is 2.
More detailed verion of the question:
Answering the question "why do you want to do this?"
I want a super wide range gearing on my Santana Rio Tandem. Say 15-130 inches.
The rear dropout spacing is 140mm. (Its an old tandem.)
The rear hub supports a freewheel.
I don't want to put a dished wheel on my tandem (too weak in my opinion), that means I want to stick with 7 speeds.
I don't want to go to a freehub at this time. When the rim wears out from braking I'll consider a whole new rear wheel with what is available at that time.
Current gearing is 24-44-54 with Megarange 11-34 on 26 inch wheels.
Major Problem: There is too big a jump in this gearing because it lacks gears in the 33-47 inch range. This around 8-10mph and is a noticeable gap at a critial speed.
I'm working on adding 4 chainrings in front to make a quad 16-28-44-54. This will smooth out the gearing, and eliminate the need for the 34, which can then be replaced with a 28 still producing a glacial 14.86 inch gear.
In theory, with the quad, an even tighter 11-12-13-15-18-21-24 cluster could be built having a 17-127 inch range with no major jumps.
The Paragraphs detailing how to perform quad gearing are omitted at this time (since I haven written them.)
Long term solution would of course be a new Santana Tandem.
Thank you
Paul Stankiewicz
Perhaps you can help me.
Summary Question:
I want to replace the 34 tooth cog on my Shimano megarange 11-34 freewheel with a smaller cog, like 26, or 28.
What's the best type of cog to do this with?
I haven't looked into the details of this other than studying Sheldon Brown's article on the this 11-34 freewheel which shows how to access the 34 tooth cog.
Desired Solutions:
1. Ideally there exists a (insert manufactures name here [i.e., Suntour]) cog that fits perfectly.
2. Less ideally, some minor Dremel tool machining of a cog that almost fits would make it fit nearly perfectly.
3. Even less ideal, major machining, cutting, welding, would be required.
I believe the correct answer is 2.
More detailed verion of the question:
Answering the question "why do you want to do this?"
I want a super wide range gearing on my Santana Rio Tandem. Say 15-130 inches.
The rear dropout spacing is 140mm. (Its an old tandem.)
The rear hub supports a freewheel.
I don't want to put a dished wheel on my tandem (too weak in my opinion), that means I want to stick with 7 speeds.
I don't want to go to a freehub at this time. When the rim wears out from braking I'll consider a whole new rear wheel with what is available at that time.
Current gearing is 24-44-54 with Megarange 11-34 on 26 inch wheels.
Major Problem: There is too big a jump in this gearing because it lacks gears in the 33-47 inch range. This around 8-10mph and is a noticeable gap at a critial speed.
I'm working on adding 4 chainrings in front to make a quad 16-28-44-54. This will smooth out the gearing, and eliminate the need for the 34, which can then be replaced with a 28 still producing a glacial 14.86 inch gear.
In theory, with the quad, an even tighter 11-12-13-15-18-21-24 cluster could be built having a 17-127 inch range with no major jumps.
The Paragraphs detailing how to perform quad gearing are omitted at this time (since I haven written them.)
Long term solution would of course be a new Santana Tandem.
Thank you
Paul Stankiewicz
