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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 09-12-10, 02:37 PM   #1
fcyu
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Needing Help [New Guy]

So recently I started biking again, and i decided to buy an old Road Bike for the heck of commuting rather than relying on public transportation and driving everywhere. Ever Since I can remember, I never utilized the potential of changing gears on a bike, so I always stayed in one gear set, my cousin was talking to me about changing it up a notch or two to a fixed gear or a single speed bike, in honestly i would prefer a single speed. Well, anyways.. enough of that, The gear i run on the Road Bike is 39 on the front and 25 on the back. Is is possible to get a 25t for the rear tire if I was to build up a bike from a frame up?

PS. I tried out 39/17 and it wasnt quite bad, but i would prefer if 39/25 was possible.

Thanks, Jason
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Old 09-12-10, 02:56 PM   #2
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Do you live somewhere with HUGE hills or something?

I've never seen a 25t SS freewheel. You can check out this site http://software.bareknucklebrigade.c...it.applet.html and mess around with chainring/sprocket sizes to get similar gear inches. For example, a 34-35t chainring and a 22t freewheel would be almost be the same.
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Old 09-12-10, 02:59 PM   #3
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You must be spinning like mad, and going nowhere. You sure you're counting right? Unless you live in the mountains then that's insane.
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Old 09-12-10, 02:59 PM   #4
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yeah, I cant see the point of that gearing unless you live in the bottom of a soup bowl or something.
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Old 09-12-10, 02:59 PM   #5
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You're going to have a hard time finding a single freewheel with more than a 22T cog. What you could try is a 110 bcd crank with a 34T chainring, which would give you a 1.55 gear ratio similar to the 1.56 ratio with a 39/25. Otherwise, if you have a cassette, you can get a spacer kit and use the 25T cog from your cassette.
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Old 09-12-10, 03:00 PM   #6
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If you never shift then just leave it. If you're always in the 25t cog then maybe you just have to ride or a while longer just to build a bit if a base in cycling. I'm not against the SS idea, but since you're new maybe just stick with what you have and see if you really like it before spending money
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Old 09-12-10, 03:08 PM   #7
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yeah, I cant see the point of that gearing unless you live in the bottom of a soup bowl or something.
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Old 09-12-10, 03:13 PM   #8
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haha, thanks for the replies guys. Yeah the only reason why I wanted to use 39/25 was because it was the gear ratio it was on when I got it from the thift store, and I road it as is. With the 39/25 I only had to pedal once for every other street light and it would cruise me all the way down to the next one. Right after I posted this, i called my cousin and he said hes running something along the lines of "46/17" on his bike, and I had no problem with that at all. But if 39/25 cant possibly work, time to stop being lazy and cruise everywhere in the city haha.
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Old 09-12-10, 03:35 PM   #9
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Oh god, that is one of my bikes biking pet peeves. Pedaling to coast is what I like to call it. Where the rider pedals like twice then coasts for as long as possible then gives another pedal or 2 and so on and so on. I don't know why, but it pisses me off beyond belief. Maybe I have anger issues...
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Old 09-12-10, 03:44 PM   #10
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Haha, but in my defense i only coast in the morning when all the main streets are empty of traffic and people, because Im to lazy to pedal regularly at 5 in the morning, in the afternoon / rush hours is the times when i put it into 39/17 since its the only actually gets me places.
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Old 09-12-10, 03:48 PM   #11
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Oh god, that is one of my bikes biking pet peeves. Pedaling to coast is what I like to call it. Where the rider pedals like twice then coasts for as long as possible then gives another pedal or 2 and so on and so on. I don't know why, but it pisses me off beyond belief. Maybe I have anger issues...
Yeah i find this a bit annoying, but more funny. Possible way to do a century?
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Old 09-12-10, 04:58 PM   #12
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Oh god, that is one of my bikes biking pet peeves. Pedaling to coast is what I like to call it. Where the rider pedals like twice then coasts for as long as possible then gives another pedal or 2 and so on and so on. I don't know why, but it pisses me off beyond belief. Maybe I have anger issues...
Pisses me off too...not so much with a low ratio but a hiiigh one, like 50-12...
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Old 09-12-10, 05:03 PM   #13
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haha, thanks for the replies guys. Yeah the only reason why I wanted to use 39/25 was because it was the gear ratio it was on when I got it from the thift store, and I road it as is. With the 39/25 I only had to pedal once for every other street light and it would cruise me all the way down to the next one. Right after I posted this, i called my cousin and he said hes running something along the lines of "46/17" on his bike, and I had no problem with that at all. But if 39/25 cant possibly work, time to stop being lazy and cruise everywhere in the city haha.
My advice: ride your bike more. You would probably like a single speed, but you will also probably hate it if you choose the wrong gear ratio (ask me how I know.) Ride your bike until you're sure about what ratio you want, then worry about the conversion. BTW, what kind of bike is it?
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Old 09-12-10, 05:04 PM   #14
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with such a low gear ratio, that's the only way you can bike. any more than two rotations and you're sure to be coasting.
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