I found 129 load tires quite stiff. They had a very narrow pressure range (1-2 psi cold) that worked best, anything outside was too soft or too hard. Replaced with 121 load and the acceptable pressure range is much wider, (7-8 psi cold).
At the right pressure they ride pretty similar, but the 121 load is more forgiving across normal on road situations.
At off road pressures not too much difference, both seemed real happy at 18 psi.
I was not able to hand mount either one, but got a lot closer on the 121 load (could do it, but probably scuff the rim) vs the 129 load (no chance).
At the right pressure they ride pretty similar, but the 121 load is more forgiving across normal on road situations.
At off road pressures not too much difference, both seemed real happy at 18 psi.
I was not able to hand mount either one, but got a lot closer on the 121 load (could do it, but probably scuff the rim) vs the 129 load (no chance).