Sizing a compact frame sight unseen
I've finally settled on a Kona Sutra frame as my new ride. The problem is that I need to buy it sight unseen. It is being brought over from the States for me. I'm having trouble getting my head around the Kona compact sizing. Their mesurements seem a bit strange compared to other bike companies. If I'm reading the chart correctly it seems that the top tube is messured from the rear of the seat post to the point where the top tube and the head tube meet. I find all of this rather confusing.
My question is this: What do you think would be better given that I'm putting a flat bar on this frame, a Kona 58 or 60cm? My biggest consern is top tube length. My mesurments are as follows:
Height 182 cm
Cycling Inseam 89.6cm
Pants Inseem 32"
Arm length 63.5cm
Have a look at Dave Moulton's site where he has some good info on bike sizing, and also compact frame...
Thanks. I've checked out many sites, used the Wrench Science calculator (seems geared toward racing bikes) and read a lot of posts.
I've narrowed it down to two sizes, what I'm having trouble with is how Kona messures its frames. I wrote to Kona and asked how they messured, c-c or c-t. They wrote back and told me that their 58cm is really 53 c-t and the 60 is 55 c-t. Some how the effective top tube is supposed to corilate in size with top tubes of real 58 and 60cm frames. Which leads me to look at the Kona diagram posted above and scratch my head in confusion. Is the effective top tube messured from the middle of the seat post to the middle of the intersection of the top tube and head tube as I have seen in every other frame I have looked at, or is it messured from the back of the seat post to the point where the top tube meets the head tube. I'm very confused.
I hope all of you appreciate the bike shops in your area where you can buy a bike trying it first!