Originally Posted by ajbrown (Post 1177238)

You had me right up to the paragraph i left from your OP. If I have not made a silly error here are the details...

If the OD of a tire is 12 inches, the circumference is 37.7 inches.
If the OD of a tire is 14 inches , the circumference is 43.98

A more real world example is the stock tires on an 8 inch rim that came with my Club Car versus the bigger 205-65-10 tires on 10 inch rims.

Stock tires: 18 diameter has a circumference of 56.55
205-65-10: 20.5 inch diameter has a circumference of 64.4

I go about 8 inches further with the larger tires during one revolution.

Originally Posted by Dr Winston O Boogie jr (Post 1177844)

Maybe someone can help me with a problem. I have a Schwinn Speedometer on my cart and the battery died. I replaced the battery an a four digit number appeared on the bottom of the screen. I played around with it for a bit to get to where it shows the speed and distance traveled. It showed that I was going 51 mph.

I then realized that that four digit number is a code for the tire size. Can someone help me out with resetting the correct code?

I have a Club Car DS with standard 8" tires on the front.

Originally Posted by Dr Winston O Boogie jr (Post 1177844)

Maybe someone can help me with a problem. I have a Schwinn Speedometer on my cart and the battery died. I replaced the battery an a four digit number appeared on the bottom of the screen. I played around with it for a bit to get to where it shows the speed and distance traveled. It showed that I was going 51 mph.

I then realized that that four digit number is a code for the tire size. Can someone help me out with resetting the correct code?

I have a Club Car DS with standard 8" tires on the front.

Originally Posted by Bobs GolfCart Speedometer (Post 1177926)

The correct tire size (circumference) for standard 8 inch cart tires is 1440 cm. Here's a link to an owners manual for the Schwinn 12 function speedometer that's most commonly installed on carts here in The Villages.

K3PGP - Experimenters Corner - Schwinn 12 Function Bicycle Computer Manual

The first page explains how to setup the tire size again after changing the battery. You can skip the part about how to calculate the correct tire size, just use 1440.

Originally Posted by tuccillo (Post 1177931)

The units are millimeters (mm), not centimeters (cm).

Originally Posted by tuccillo (Post 1177931)

The units are millimeters (mm), not centimeters (cm).

Originally Posted by tomwed (Post 1177937)

Not for nothing, but the OP did say he wanted to put on larger tires. They would be pretty big.

Originally Posted by Bobs GolfCart Speedometer (Post 1177926)

The correct tire size (circumference) for standard 8 inch cart tires is 1440 mm. Here's a link to an owners manual for the Schwinn 12 function speedometer that's most commonly installed on carts here in The Villages.

K3PGP - Experimenters Corner - Schwinn 12 Function Bicycle Computer Manual

The first page explains how to setup the tire size again after changing the battery. You can skip the part about how to calculate the correct tire size, just use 1440.

Originally Posted by Dr Winston O Boogie jr (Post 1178041)

Thanks, that helps. I saw that site before but was a bit concerned because the pictures of the speedometer in the manual differ from mine. But I'm now thinking that they are all pretty much the same except for the outer case.

What kind of speedometers do you install and how much are they?