I looked on Ultra BMX Gear Calculator and they now have now added a 26 x 2.10 tyre option so I have done a comparison of the gears between a 24″ Cruiser running a 24 x 1.60 Power Block back tyre and a DJ bike running a 26 x 2.10 rear tyre and I have added it here as reference to make it easy for me to find 🙂
Cruiser running a 24 x 1.60 Tioga Power Block Rear tyre:
36 x 16 = 52.88
37 x 16 = 54.35
My Sprint Bike is running a 24 x 1.75 S&M TrackMark Tyre and that has the following roll-out:
37 x 16 = 54.62
Dirt Jump bike running a 26 x 2.10 Tioga PowerBlock Tyre:
32 x 16 = 52.38
31 x 15 = 54.13
27 x 13 = 54.39
25 x 12 = 54.56
So for me the 25 x 12 gearing is right in between by race Cruiser (54.35) and my Sprint Cruiser (54.62) at 54.56 so I think I will try that on my DJ bike when I get it back and get some 26 x 2.10 Tioga PowerBlock’s as well!