New Shoes
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Fleet Mechanic
Joined: Oct 2012
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New Shoes
So I got some new tires for my 1988 E250. Stock size is listed as 215/85r16 on the door tag.
The old tires were 225/75r16
Up sized the new tires to 235/85r16 (the size listed for the e350)
I will have to change my speedo gear. According to GPS the odometer is now off by 10%. Drops my rpm at hwy speeds. The rpms at 70mph are what they used to be at 65mph. Lower cabin noise and maybe a little more mileage.
The old tires were 225/75r16
Up sized the new tires to 235/85r16 (the size listed for the e350)
I will have to change my speedo gear. According to GPS the odometer is now off by 10%. Drops my rpm at hwy speeds. The rpms at 70mph are what they used to be at 65mph. Lower cabin noise and maybe a little more mileage.
Senior User
Joined: Aug 2014
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inaccurate speedo
So I got some new tires for my 1988 E250. Stock size is listed as 215/85r16 on the door tag.
The old tires were 225/75r16
Up sized the new tires to 235/85r16 (the size listed for the e350)
I will have to change my speedo gear. According to GPS the odometer is now off by 10%. Drops my rpm at hwy speeds. The rpms at 70mph are what they used to be at 65mph. Lower cabin noise and maybe a little more mileage.
The old tires were 225/75r16
Up sized the new tires to 235/85r16 (the size listed for the e350)
I will have to change my speedo gear. According to GPS the odometer is now off by 10%. Drops my rpm at hwy speeds. The rpms at 70mph are what they used to be at 65mph. Lower cabin noise and maybe a little more mileage.
Thread Starter
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Fleet Mechanic
Joined: Oct 2012
Posts: 1,943
Likes: 21
Man, did you do a gear swap or really bump up your tire size?
Mine is a mechanical speedo, so it is easy to swap the gears. Just one bolt holding it in and its even easy to access.
Mine is a mechanical speedo, so it is easy to swap the gears. Just one bolt holding it in and its even easy to access.
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Joined: Aug 2014
Posts: 188
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mods
Mine is f100 with 6.9c6 and 3.55. Standard in Australia they have about 255ci six and 235/75/15i think. Now with a fair bit more torque the 31/10.5/15's are j just about right for a towing application. Chassis isn't quite up to it but who cares its fun. Springs up rated to hell carries a ton easy
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