</font><font color="blue" class="small">( The dimensions of the rear are 31x13.50-15 and the front are 22x9.00-12. )</font>
</font><font color="blue" class="small">( The manual for my TC24d calls for 29x12-15 in the back, and 22x9-12 in the front? )</font>
Same with my 24D. When I first started looking, the machines on the lot had the 29" on them, by the time I decided to buy, they were coming with the 31". I think they "upgraded" to the larger tire but never changed the manual or sales brochure.
But here's were I think it gets interesting. I have always wondered if that change in tire size should have had a change in gearing to compensate for loss of power. I know its not much, about 6% or 7% (6 inches of travel per rotation), but when we did that much of a change on our Jeeps with oversized tires, we had better known the difference and adjusted our cruising speed as shown on the speedometer or get some tickets. 50 mph on the speedometer was closer to 60 mph as an example. In other words it resulted in quite a bit of change on the effective gear ratio.
Most here have always said they run out of traction before they run out of power. My main disappointment with the 24D has always been that I run out of power before I run of traction, and that is with just washer fluid in the tires and a blade on the back with FEL. The tractor just stops when digging in with the FEL with little change on the rpms of the motor. There is plenty more power to deliver to the wheels, it just can't. I know the HST is infinite in gear ratios, etc, but it all comes down to the relief valve. Mine has been checked and is at the highest setting recommended. The larger tire simply gets a mechanical advantage over the relief valve (IMHO) under strain and the valve pops.
I've posted on the issue of the HST not getting all the power to the wheels many times before and have accepted it as a fact of life with the basic function of HST, but still wonder if there was more deliverable power available for digging on the older machines with smaller tires.
Does that make any sense? Anybody else have the smaller tire on the class I boomers and not have trouble with power?
Brad