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Old 10-07-08, 10:20 PM   #1
azisme
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Looking for 11/28 freewheel or other higher gear option

I have an older, like new, low end mountain bike that I installed an electric hub onto to use for commuting. The problem is the bike is geared too low for street use especially with the electric motor assisting. I currently have Shimano SIS gears. The crank has 28, 38, and 48 teeth. The rear is an MF-HG37 FREEWHEEL with 14/28 gearing. What is my cheapest option to improve my gear ratios for increased speed? I really on nee the high speed in one gear, for the other gears, I will take what I get. The best solution I can find is to install a cogset with 11 teeth on the smallest cog, but they are apparently pretty rare nowadays. I am open to any and all options as long as the cost is low. My only goal is to increase my top cruising (pedaling) speed from around 18-19 mph to around 22-23 mph or more.

Note: My motor will propel the bike up to around 20 mph on level terrain, no wind. I would still like to get some exercise out of my commute which is why I am looking for a higher gearing option.
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Old 10-07-08, 10:22 PM   #2
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Might try a road triple for the front - that would give you 52 or 53 on the big ring.
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Old 10-08-08, 09:57 AM   #3
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I'm not sure freewheels can even use an 11 tooth cog due to the body circumference. At any rate they're not common. You might be able to find a 12, but in general 13 seems to be the bottom of the ubiquitous range. I think BBM has the right idea. If your wheel had a cassette hub, that would be different.
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Old 10-08-08, 10:11 AM   #4
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Originally Posted by jbonamici View Post
I'm not sure freewheels can even use an 11 tooth cog due to the body circumference. At any rate they're not common. You might be able to find a 12, but in general 13 seems to be the bottom of the ubiquitous range. I think BBM has the right idea. If your wheel had a cassette hub, that would be different.
Shimano was making 11-28 and 11-34 freewheels, but non of my suppliers are carrying them any more, so I think Shimano has dropped them. If I had known they were going to dissapear, I would have bought some up while they were available.
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Old 10-08-08, 11:18 AM   #5
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Originally Posted by bigbossman View Post
Might try a road triple for the front - that would give you 52 or 53 on the big ring.
1+. Especially where you have the a 48 for the big ring. I don't think
you would have to change the crank, at least if you have a 110 BCD for
the current crank. Of course that means a new chain.

I have some 12-28 or 30 Sachs freewheels, but I would go with the larger big
ring.
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