Im running a 2.1 ground control front and a 2.2 race king rear on my 29er hard tail.
I know most run bigger front but i was running the gc front and back while it was wet but its dryer and drying out so i put a race king on the back which i already had.
Gc is 2" body 2.1" tread, rk is 2.2" body 2.1" tread approximately.
Found the smaller gc cuts and grips and the bigger fast rolling rk allows me to motor but has some bump smoothness with the bigger body.
The ground control is great and rolls nice but i commute too and i figure i dont need to wear it out while its dry, ill put it back on the rear in the spring next year.
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Thread: Running a smaller front tire