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Frame sizing

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Old 03-20-07 | 05:04 PM
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Frame sizing

I'm converting an old Motobecane to a SS.

I normally ride a 58 or a 59.

This frame is a 54.

Is this going to be too small or will I be able to work around the frame size to get a good fit.

This will be primarily a commuter bike.
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Old 03-20-07 | 05:10 PM
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It won't be optimal but it will probably work OK, as long as your commute is not particularly long. It's easy to find long seatposts these days and if you need to jack up the bars there's always Nitto Technomics.
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Old 03-20-07 | 05:16 PM
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Personally I like my bikes a little smaller. I'm about 5'10 or 5'11 and ride about 52cm. It's always better to have too small than too big - you can switch out the seatpost / stem / bars on a too-small bike, but on a too-big bike all you can do is hope your body grows. Plus too-big bikes feel like boats...

But really, the only measurement that is actually relevent in my opinion is the top tube + stem measurement. Too big or too small and you'll have issues. I run my bikes small but use a high seat and long stem so it equals out on the fun-meter.
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Old 03-20-07 | 05:26 PM
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If you can find a frame closer to your size without going nuts, do it. That is a pretty big size difference IMHO, and probably won't be fun to deal with.
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Old 03-20-07 | 05:35 PM
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Just compare the top tube + stem measurements on each frame, if the smaller one has a shorter stem, size up as needed.
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Old 03-20-07 | 05:40 PM
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Originally Posted by Aeroplane
If you can find a frame closer to your size without going nuts, do it. That is a pretty big size difference IMHO, and probably won't be fun to deal with.
+1. And it's a motobecane, which may mean French threaded headset and Swiss threaded bottom bracket, assuming it's of a seventies vintage. While these are certainly "problems" easily overcome, if you plan any upgrades you either need a shop familiar with these issues (very few, IME) or need to figure it out on your own.
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Old 03-20-07 | 05:46 PM
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Well, poop.

I guess I'll just keep an eye out for old, inexpensive road frames that'll make good SS-conversion candidates.

I'm still going to take the Motobecane down to the LBS and see what they say.
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Old 03-20-07 | 05:59 PM
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Measure the TT that is what matters. If that is the case it doesn't really matter how short the st is... well you may have to get a longer seatpost and stem so consider how much the correct size would cost too.
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Old 03-20-07 | 06:00 PM
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St. Louis is hilly.. keep the gears on there.
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Old 03-20-07 | 07:37 PM
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UPDATE:

While my Motobecane is a sweet vintage mount (from the early '60s is what the bike mechanic at my LBS said), it is not a good candidate for a single speed commuter.

Time to find another older road bike. craigslist here I come!
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Old 03-20-07 | 07:38 PM
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Originally Posted by bonechilling
St. Louis is hilly.. keep the gears on there.
The primary route I would be riding is not very hilly.
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Old 03-20-07 | 07:52 PM
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Originally Posted by bonechilling
St. Louis is hilly.. keep the gears on there.
what st. louis are you talking about???
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