I've used both the 20" x 1.75" and the 20" x 2.1" and i'd suggest the 20" x 1.95" The 1.75" that im using at the mo IMO is far too small, you have to run it at hard pressures not to max it out, whereas the 2.1" was ok but you can save some weight by getting the 1.95". As far as grip goes the whole range work very well for street surfaces, but the second you add wet mud to the mixture they don't work well atall!!. I know Laurence-trials has used the 20x1.95" on his mod and is now using the 24"x2.1" and think he is getting on with it well, Also Kenny-trials Had used both the 20x2.1" and is now using the 20x1.75" so we've all had our fair share of using the kenda tyres But like i said above the 1.75" has to be run at low pressures on wet muddy surfaces to get slight grip but at hard pressure does'nt grip atall, for street that you'll be riding i'd still suggest the 1.95" as i know you like your footjam whips hope that helped sorry for being a little long winded