Kona 20" steel frame fit a bloke of 6'1"?

I'm 6'3" and have a 20" and it's fine. If you are 6'1" I think you could go for either depending on your preference for smaller/larger bikes.
 
Flanners":1x1wwnvy said:
Would a 20" Kona steel frame fit me at 6'1" or should I opt for an 19" one?
I think you could probably go either way. I'm 6'1" and I ride a 20" '94 Kilauea with plenty of seatpost showing (about 74cm bottom bracket to saddle rail, from memory) and a 110mm stem. It fits me fine, but I've been thinking about trying a 19".

I can take a few measurements of mine if you like.
 
Here you go.

BB to seat rail: 74cm
BB to saddle top: 78cm
Front axle to top of headset: 59cm
Seat post visible (to rail): 22.5cm
Actual top tube length c-c: 58.5cm

The stem's a 110mm Thomson Elite with a little rise, flipped to give a little drop, with a 5mm spacer underneath. That puts the bars about 10cm below the top of the saddle.

That should give you an idea. If you like your bars lower, you'll need the 19". Drop me a PM if you want any other measurements.
 

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19 is intended for height 5-9 to 6-3, 20 is intended for height 6-0 to 6-6. The 20 has a 1" longer seat tube (obviously), a 0.5" longer top tube (24.0 effective vs 23.5) and a 2cm longer head tube (15 vs 13). So the standover on a 20 is also almost an inch higher too.

So 19 is really the size for you if you're 6-1, but say somebody of 6-1 had relatively short legs and long torso, then (paradoxically perhaps) maybe a 20 would be better for the longer top tube.

But really it depends whether you like a big bike or a little bike under you. Even the size 18 is intended for up to 6-0, so if you like the feel of a small frame, don't rule that out either.
 
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