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Old 12-22-09, 08:44 PM   #1
FlaMike
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Having Trouble Determining Fit Using Online Calculators - Any Suggestions?

Howdy,

I have recently decided to order a Jamis Aurora from a local dealer. Unfortunately, I cannot find any models in stock within 100 miles, so I'm trying to determine my fit in order to order the best size as accurately as possible.

I've must have taken 20 different measurements and used a dozen different online fit calculators, with the results being all over the place. So I was hoping I could leave my measurements here and get some recommendations.

I'm 5' 10" 255 lbs, 30.5" inseam. I'm okay with the idea of using drop bars (will be my first bike with drop bars) but I would like fit that allows a more relaxed and more upright position (as far as drop bars are concerned).

Any advice would be greatly appreciated.

Mike.
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Old 12-22-09, 08:51 PM   #2
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Seems to me your local dealer would help you with your size.
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Old 12-22-09, 08:54 PM   #3
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Any fit calculations from an online calculator will just be a guideline hence the numbers being all over the place. Quantitatively you can average all the numbers of do all sorts of mathematical manipulations, but fit is more qualitatively and you should probably see a dealer and get on a bike. What you can do is find a Jamis dealer and talk to them about your problem. Perhaps they have a bike that has identical or near identical geometry that you can figure out your size on.
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Old 12-22-09, 09:00 PM   #4
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you need to find a bike with a similar geometry that your lbs will have in stock and test ride it. The bike shop should know bikes they have on the shelf that have a similar enough geometry to test ride. Once they figure out what size frame you need, they can get the bike and custom fit it to you with things like new saddle heights and stem lengths and stem angles.

Any bike shop that is going to be ordering you a $1000 bike should be more than happy to help you with the fit, and if they don't answer all of your questions and satisfy your fit anxiety, you should get your bike somewhere else.
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Old 12-22-09, 09:06 PM   #5
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I just rode down to the convenience store to get a lotto ticket on my bike.
I had on my walking shoes with thick soles and it changed the fit on my bike.

You say you have 30.5 inseam.
Shoes socks can change that.
Did you measure up to you sit bones?
When you get a fit at a bike shop you need to wear all of your bike riding out fit.

Different bike brands have different ways to measure their bikes.
My son-in-law is your size. He rode a 56cm Cannondale.
Jamis has a 53-55cm bike size but no 56cm.
Your dealer is your best help.
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Old 12-22-09, 10:05 PM   #6
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Quote:
Originally Posted by FlaMike View Post
I've must have taken 20 different measurements and used a dozen different online fit calculators, with the results being all over the place. So I was hoping I could leave my measurements here and get some recommendations.
I tried a number of different fit calculators and they were all pretty similar in terms of their recommendation for the most critical fit dimension: effective top tube length.

Quote:
I'm 5' 10" 255 lbs, 30.5" inseam. I'm okay with the idea of using drop bars (will be my first bike with drop bars) but I would like fit that allows a more relaxed and more upright position (as far as drop bars are concerned).
Sounds like you're slightly taller than I am, but with shorter legs. I'm 5'9" with a 32" inseam. I ride a bike with a 546mm top tube, 110mm stem, and use handlebars with 89cm reach and 128mm drop. I wouldn't call my riding position aggressive by any means, though some might disagree. I initially equipped the bike with a 100mm stem then switched to 110mm after gaining some fitness and flexibility.

Seems like you may have a tough time fitting on the Aurora. If you want to be able to stand over the horizontal top tube, it sounds like the 50cm model is your only choice. Given your seemingly long torso, this will leave you sitting quite a bit more upright than I do or using a relatively long stem. I worry that long stems on small frames may change the weight distribution and handling of the bike. FWIW, compact frames (= sloping top tube) often work better for those with long torsos and short inseams. The sloping top tube means you can easily stand over a bike with a longer top tube. My 54cm frame, for example, has a standover height of 764mm. That's less than the 50cm Aurora frame (= 773mm), despite the fact that my top tube and seat tube are quite a bit longer than the Aurora's.

Quote:
Any advice would be greatly appreciated.
I have two pieces of advice: 1) find a better dealer, and 2) never buy a bike you haven't test-ridden.
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