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I could use a little help from the experts. My son is looking for a new bike. Keeping it simple approx 5'10" 250lbs and a short 30" inseam with size 13 feet. His upper body is probably more in line with a large. But the short inseam means he can't straddle a large. Any advice would be appreciated.
 

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Sounds like I'm almost identical to your sons dimensions except I'm a bit heavier. I ride a large 19" frame and have an inch of clearance when its cold. When it's warm, not so much :) I feel like I have plenty if clearance for the situations I get myself in. My guess is that the stand over varies by manufacturer and model.


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You should be able to find the geometry and measurements for any bike you're looking at. It doesn't necessarily just list a height range, it will list stand over height, and the various tube lengths and angles. I'm built similarly, well a lot heavier, with a 31" inseam and I haven't met a large mountain bike I didn't like. Medium feels to cramped to me.


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Same measurements as me (except the foot) and I'm on a 17.5 medium rockhopper comp 29..couldn't ask for a better fit imo.
 

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If you're going the custom route. Actually, it's a very good tool. But it doesn't have much to do with standard bikes. Thanks for trying.
Actually, it has EVERYTHING to do with standard bikes.
Once you know your measurements, you can then look for a frame that fits. just compare the geometry numbers.
Even among standard bikes (is there really such a thing?), bike manufacturers do not tend to be "standard" in geometry. They all vary even if only slightly.

You won't find a bike that is an exact fit, (unless custom built) but you will find one that is close enough. A better fit can be achieved by swapping bits
 
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