My bus came with 1200 22/5 on it and I have read were some guys change to 11r22/5 .What size tire and brand is everyone satisfied and gave the best service .
You lose top end speed and fuel mileage going to the smaller tire, the ones I know with the 5 all run Toyo 11/22.5 ,1 owner told me they were taller than most 11/22.5 tires I don't know if they are or not, Another owner has changed to 295/80/22.5 he says they are wider and taller than his 11/r/22.5 were and drive and ride better than his 11/r/22.5 did
I think you mean 11x24.5 which is standard on most all TRUCKS. 12Rx22.5 is the long time standard for buses. 22.5 is an indication of diameter where using the 24.5 increases the tire diameter thus slightly increasing the road speed for any given axle rpm.
When converting to an 11x24.5 tire you must also change the Wheel for it to fit, adding a substantial $$$ expense. So, all new Tires and Wheels, and keep in mind that the 24.5's being taller will impact the clearances in your wheel well and possibly even the ride height as seen by the leveling valves.
I'm not aware of anyone using 11x22.5 tires....., there's no point in it, the 12's are much more common and provide better road contact. It's true that the 12Rx22.5 is becoming somewhat endangered, being edged out and replaced by metric tire sizes, of which I have no knowledge since I live in the past about these things and cling to what has been working for decades.
The 12 indicates the tread width at the ground, and a 12.5 means a slightly wider tread contact. Greyhound used for a very long time 12.5Rx22.5 LEASED Firestone tires which were very hard to buy directly without the lease arrangement, that's why most operators used the 12Rx22.5 since the 12.5 was much harder, basically Unobtainium, (and pricier$$) to get.
My 5A had 11 r 22 tires on it when i got it and that is what i ran the 12 years that i had it. Kept a log of my mileage and averaged 7.24 mpg over almost 90,000 miles. 8v71 with N60 injectors, auto tranny and 3.36 rear end.
The top semi truck tire sizes are all 22.5 sizes. 11R24.5 are under 10% of the market. I know from experience that 11R24.5 can be harder to find.
My 1995 Dina has 11R24.5 tires on it, and 24.5 is listed on the VIN plate. The 1999 Dina I am planning to buy has 12R22.5 on the drives and tags with 315/80R22.5 on the steer. The VIN plate on the 1999 shows 12R22.5 across all axles. I like that it has aluminum wheels.
We are the only country in the world that ever ran the 24.5 tires, they came into play when fuel prices started to rise, the truckers used the size for a little better fuel mileage less rpm per mile translated into better fuel mileage they thought but they lost drive train to pavement torque with the taller tires with the engines back then,The 11r/22.5 or it 's metric equal is your most popular tire on the market you can almost buy those at a drug store, I never change from the 12r/22.5 on my MCI 5.with the 6v92 (330 hp) and 740 Allsion, and 3:36 gears in was always in the 8 to 10 mpg range. Dave went to the 11r/22.5 with his 5 with the V-671N/A and 644 Allison, it helped him on power and fuel economy
Same as Ed on our 5C Toyo's are a very nice smooth riding tire. And 11's are a lot less too. :^
I go for 12r22.5 on the rears but I usually go for a cheaper brand: the one I have in mind hasn't given problems to professional trucks- it just doesn't last as long in terms of mileage. I change them every 6-8 years. For the fronts I go for 11r22.5 but I use a reputable brand. Right now I have Firestone fs591s. I checked the weight and weight distribution of my mc5 and even on the rears I'm quite a bit below the individual load rating of the tyres
Quote from: Dreadnought on October 03, 2025, 01:30:33 PM
I go for 12r22.5 on the rears but I usually go for a cheaper brand: the one I have in mind hasn't given problems to professional trucks- it just doesn't last as long in terms of mileage. I change them every 6-8 years. For the fronts I go for 11r22.5 but I use a reputable brand. Right now I have Firestone fs591s. I checked the weight and weight distribution of my mc5 and even on the rears I'm quite a bit below the individual load rating of the tyres
I do similar. Drive axle are a cheaper tire. I use better tires on the steer axle. I swap the steer tires back to the tag axle every five years and get new steer tires. The drives I usually replace every ten years.