Singlespeed & Fixed Gear - Trying to figure out my gearing...
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
08-30-10, 01:54 PM
I recently got a Dawes SST AL as my commuter. I use it as a freewheel'd single speed, not fixed. The problem is that i feel like im spinning too much once im on a smooth open road. Its currently a 48:17 setup. Im debating getting a 16t freewheel but am worried it will make no worthwhile difference. Any opinions on the matter? moving from a 17t to a 16t freewheel?
Or should i just get like a 50t chainring? which will require a new chain as well. And which ring would you suggest? its just a budget bike. I prefer to spend the real dollars on my mtb.
thanks for any advice.
08-30-10, 02:03 PM
Changing the freewheel by one tooth will make quite a big difference. I think with a 48t chain ring, dropping a tooth on the freewheel is like 4 gear inches. http://software.bareknucklebrigade.com/rabbit.applet.html
check out that site and play around with different setups.
08-30-10, 04:46 PM
There will be a difference. Not huge but definitely noticeable.
08-30-10, 04:58 PM
Gear inches = Chainring tooth / Cog tooth x Tire diameter in inches.
Common tire sizes in inches.
700x23c = 26.275
700x25c = 26.375
Example: 44 / 17 x 26.275(23c) = 68.005.... round it to the nearest tenth and voila!
08-30-10, 05:17 PM
How much is "too much spinning" ??
With a 48-17 you'll be doing 25mph at 110rpm...
With a 48-16 you'll be doing 25mph at about 102rpm.
08-30-10, 05:21 PM
I bet he tops out at ~80rpm and feels too slow, so moving up a gear or two to higher his speed at ~80rpm.
08-30-10, 07:18 PM
I went up two teeth from my 16:48 to a 18:48. And it's a lot more comfortable, the switch was pretty big and I don't regret getting a 17t. You should be good jumping up a tooth.
Powered by vBulletin® Version 4.1.12 Copyright © 2013 vBulletin Solutions, Inc. All rights reserved.