Changing tire size

GeoffM · 09-20-2004, 12:18 PM

Thinking about changing to a set of Goodyear Triple Tread tires as all the comments seem to be extremely positive. The problem is, the smallest size is a 19565R15, and the Prius seems to want a 185.

Can I put 195's on the car, and if I do will I screw up the speedo, nav system calculations, etc?

If the answer is no, then I'm also considering the HydroEdge from Michelin, but from what I've read there's a big difference of opinion over the road noise from these tires.

All comments welcome.

Thanks,

Geoff

olends · 09-21-2004, 11:25 AM

185
Section Width: 7.28 in 185 mm
195
Section Width: 7.67 in 195 mm

185
Rim Diameter: 15 in 381 mm
195
RimDiameter: 15 in 381 mm

185
Rim Width Range: 5 - 6.5 in
195
Rim Width Range: 5 - 7 in

185
Overall Diameter: 24.46 in 621.28 mm
195
Overall Diameter: 24.98 in 634.49 mm

185
Sidewall Height: 4.73 in 120.14 mm
195
Sidewall Height: 4.99 in 126.74 mm

185
Radius: 12.23 in 310.64 mm
195
Radius: 12.49 in 317.24 mm

185
Circumference: 76.84 in 1951.7 mm
195
Circumference: 78.47 in 1993.1 mm

185
Revs per Mile: 850.3
195
Revs per Mile: 832.6

185
Speedometer1: 60 mph 100 km/h
195
Speedometer2: 58.7 mph 97.9 km/h

195's
Speedometer Difference: 2.125% too slow
Diameter Difference: 2.09% larger

GeoffM · 09-21-2004, 12:00 PM

Thanks olends,

I found another thread talking about changing tires/wheels and also a real handy online calculator for comparing the dimensional differences between tire sizes. Doesn't really look like there's much downside to going to the 195's other than a bit of speedo inaccuracy and potentially small loss in mpg.

Now all I need to find is someone who has tried the Triple Treds on a Prius!

Geoff

djasonw · 09-21-2004, 01:53 PM

I read some good things about the goodyear assurance tires. I changed the OEM tires as soon as I bought my car as I really disliked them. I don't think you can go wrong with the next tire size. The MPG hit will be minimal. I also remember reading that there is a setting on the screen where you can set the tire size. Don't forget that the tire size in Europe is different. This is probably why they have this setting change available. If you do get the tires, let us know what you think. Also, please tell me where you service your car. I live on Long Island too. Thanks!

GeoffM · 09-21-2004, 02:30 PM

I'm probably going to give the Goodyears a try. The dealer's going install them before I pick up the car on October 9th, and then I'll have a nice 1,000 mile ride home to see how I like them.

As for service, I was about to ask the same thing from all the other LI Prius owners - who do you like??

Geoff

09-20-2004, 12:18 PM	#1
GeoffM Join Date: Aug 2004 Location: Long Island, NY Posts: 90 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Changing tire size Thinking about changing to a set of Goodyear Triple Tread tires as all the comments seem to be extremely positive. The problem is, the smallest size is a 19565R15, and the Prius seems to want a 185. Can I put 195's on the car, and if I do will I screw up the speedo, nav system calculations, etc? If the answer is no, then I'm also considering the HydroEdge from Michelin, but from what I've read there's a big difference of opinion over the road noise from these tires. All comments welcome. Thanks, Geoff

09-21-2004, 11:25 AM	#2
olends Join Date: Jan 2004 Location: Clifton Park, NY (near Albany) Posts: 218 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Re: Changing tire size 185 Section Width: 7.28 in 185 mm 195 Section Width: 7.67 in 195 mm 185 Rim Diameter: 15 in 381 mm 195 RimDiameter: 15 in 381 mm 185 Rim Width Range: 5 - 6.5 in 195 Rim Width Range: 5 - 7 in 185 Overall Diameter: 24.46 in 621.28 mm 195 Overall Diameter: 24.98 in 634.49 mm 185 Sidewall Height: 4.73 in 120.14 mm 195 Sidewall Height: 4.99 in 126.74 mm 185 Radius: 12.23 in 310.64 mm 195 Radius: 12.49 in 317.24 mm 185 Circumference: 76.84 in 1951.7 mm 195 Circumference: 78.47 in 1993.1 mm 185 Revs per Mile: 850.3 195 Revs per Mile: 832.6 185 Speedometer1: 60 mph 100 km/h 195 Speedometer2: 58.7 mph 97.9 km/h 195's Speedometer Difference: 2.125% too slow Diameter Difference: 2.09% larger __________________ On this site, a powerful engine will be built... an engine that will someday let us explore strange new worlds... and seek out new life and new civilizations. This engine will let us go boldly where no man has gone before.

09-21-2004, 01:53 PM	#4
djasonw Senior Member Join Date: Jul 2004 Location: Belle Harbor, NY Posts: 643 My Car: 2004 Prius Model: Package: #9 Thanks: 26 Thanked 20 Times in 19 Posts Friends: 1	Re: Changing tire size I read some good things about the goodyear assurance tires. I changed the OEM tires as soon as I bought my car as I really disliked them. I don't think you can go wrong with the next tire size. The MPG hit will be minimal. I also remember reading that there is a setting on the screen where you can set the tire size. Don't forget that the tire size in Europe is different. This is probably why they have this setting change available. If you do get the tires, let us know what you think. Also, please tell me where you service your car. I live on Long Island too. Thanks!

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09-21-2004, 12:00 PM	#3
GeoffM Join Date: Aug 2004 Location: Long Island, NY Posts: 90 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Thanks olends, I found another thread talking about changing tires/wheels and also a real handy online calculator for comparing the dimensional differences between tire sizes. Doesn't really look like there's much downside to going to the 195's other than a bit of speedo inaccuracy and potentially small loss in mpg. Now all I need to find is someone who has tried the Triple Treds on a Prius! Geoff

09-21-2004, 02:30 PM	#5
GeoffM Join Date: Aug 2004 Location: Long Island, NY Posts: 90 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	I'm probably going to give the Goodyears a try. The dealer's going install them before I pick up the car on October 9th, and then I'll have a nice 1,000 mile ride home to see how I like them. As for service, I was about to ask the same thing from all the other LI Prius owners - who do you like?? Geoff