Originally Posted by
sweetspot
A great bike but for the kind of riding I am doing (a lot of light singletrack)
What are Your suggestion? What would You do?
In my Opinion....
Sell the Jamis buy a Giant TCX SLR cyclocross (high BB 60mm) and convert it to 650x47/48
I've ridden 75mm bb drop 700x40 on light singletrack and the BB height was a huge Negative!
I think the difference between a 700x40 and 650x47 is like 12-13 ish mm (radius)
so a 60mm BB drop converted to 650b would be around the equivalent (BB to ground) to a 73mm bb drop on 700x40
Honestly,,, all depends on your Singletrack and what is acceptable for a BB height for you. everybody has a different ride style.
Edit: nevermind my maths..... Riding Gravel says 20.1 mm difference on Diameter. so 10mm difference on radius. between a GK SK 700x40 vs 650x47 WTB Horizon.
http://ridinggravel.com/components/w...-650b-vs-700c/
Regardless, that puts a 60mm BB 10 mm closer to the ground after a conversion to 650b which is respectable for singletrack riding. in my opinion.