Changing Tire Size...effects? if any?
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
Changing Tire Size...effects? if any?
I've changed all 4 tires from a BFGoodrich 225R70x15 tire to a BFGoodrich 235R60x15. What will this affect (other than ride height)?
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Hi
I don't believe that you will feel a difference by changing the same tire brand from 225 to 235 size.
Changing from 225 to 255 can be felt , specially on the front and this in different ways. Or changing tire brands can sometimes be felt.
Why didn't you go 255 in the back ?
Rgds Günther
I don't believe that you will feel a difference by changing the same tire brand from 225 to 235 size.
Changing from 225 to 255 can be felt , specially on the front and this in different ways. Or changing tire brands can sometimes be felt.
Why didn't you go 255 in the back ?
Rgds Günther
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
Hi
I don't believe that you will feel a difference by changing the same tire brand from 225 to 235 size.
Changing from 225 to 255 can be felt , specially on the front and this in different ways. Or changing tire brands can sometimes be felt.
Why didn't you go 255 in the back ?
Rgds Günther
I don't believe that you will feel a difference by changing the same tire brand from 225 to 235 size.
Changing from 225 to 255 can be felt , specially on the front and this in different ways. Or changing tire brands can sometimes be felt.
Why didn't you go 255 in the back ?
Rgds Günther
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
Yeah...you're right. But that's what I am showing right now. I'll check again. If it shows like I said...what would cause that? (speedo=60, actual=70)
Last edited by vetteguy75; Dec 28, 2016 at 05:43 AM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,185
Likes: 9,324
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
I did that. Its 77-78 reading at 70, not quite 10 mph at 70. Its around an 7-8 % across the board. I was going to change the gears in the box, just havent got around to it yet. I cant remember which way to go, I thnk I need a larger gear to slow it down
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
Is that difficult to do?
Melting Slicks
Joined: Mar 2005
Posts: 2,094
Likes: 298
From: Midlothian VA
Compared to the OEM tire size (which your transmission was originally calibrated to) Your new tires should yield an actual/GPS speed of 57.8 mph when the speedometer reads 60 mph. Looks like your speedometer needs calibration OR your drive gear needs changing.
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,185
Likes: 9,324
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,185
Likes: 9,324
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Yet another thing I need to do this sprng
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,185
Likes: 9,324
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Youll need to take yours out so you know which way to go
http://www.ecklerscorvette.com/trans...d-sensors.html
http://www.ecklerscorvette.com/trans...d-sensors.html
Racer
Joined: Nov 2005
Posts: 285
Likes: 88
From: Pennsylvania
2016 C3 of Year Finalist
235/60's are too small on a C3, especially in the rear, doesn't fill in the wheel wells as it should.
Sorry, I know you already bought them, but I am on a bit of a crusade, as I keep seeing these little tires on Vettes. The diameter is too small! Spot them at a shows from 500 feet away all the time.
The devil is in the details and a 1" diameter shrink from the stock diameter doesn't make it.
245/60 minimum (still a tad too small IMO), 255/60 ideal, especially in the rear.
225/70/15 tires look ideal on a C3.
Better yet, Coker just released a Wide-Oval Radial (also red lines). This is big news! Exactly what the original designers of the C3 chose, knowing the wheel wells needed filling for the best look with that body.
This guy explains it better than I am:
Sorry again!
Sorry, I know you already bought them, but I am on a bit of a crusade, as I keep seeing these little tires on Vettes. The diameter is too small! Spot them at a shows from 500 feet away all the time.
The devil is in the details and a 1" diameter shrink from the stock diameter doesn't make it.
245/60 minimum (still a tad too small IMO), 255/60 ideal, especially in the rear.
225/70/15 tires look ideal on a C3.
Better yet, Coker just released a Wide-Oval Radial (also red lines). This is big news! Exactly what the original designers of the C3 chose, knowing the wheel wells needed filling for the best look with that body.
This guy explains it better than I am:
Sorry again!
Last edited by Bally; Dec 28, 2016 at 12:01 PM.
Pro
Joined: Jun 2016
Posts: 567
Likes: 82
From: Auckland
Race Director
Joined: Mar 2016
Posts: 14,351
Likes: 8,161
From: Napa Valley California
I'm running BFG T/A 245-60-R15's front and rear. They ride good and I like the fact that I can rotate them front to rear. When I turn my front wheels to the fully locked position, my tires just kiss the inside wheel well. You may not have that issue with the 235's.
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Hi
For show and shine ok; but for driving with the max speed rating at only 180 kmh not even legal over here in Europe.
With a better speed index , this tire would be nice.
Rgds Günther
Better yet, Coker just released a Wide-Oval Radial (also red lines). This is big news!
With a better speed index , this tire would be nice.
Rgds Günther
Le Mans Master
Joined: Aug 2006
Posts: 7,425
Likes: 1,559
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
[QUOTE=vetteguy75;1593745273]I've changed all 4 tires from a BFGoodrich 225R70x15 tire to a BFGoodrich 235R60x15. What will this affect (other than ride height)?
Here's a calculator:
http://www.discounttiredirect.com/di...nfoTireMath.do
Here's a calculator:
http://www.discounttiredirect.com/di...nfoTireMath.do
Racer
Joined: Nov 2005
Posts: 285
Likes: 88
From: Pennsylvania
2016 C3 of Year Finalist
Otherwise:
255/60/15 rear, front if they don't rub.
If they rub:
245/60/15 front
Any smaller, too much negative space in wheel wells.
BFG's wear very well, rotation isn't a big issue unless lots and lots of miles driven.
235/60's have a stiffer sidewall, so the car will handle better than 225/70's, just won't look optimal doing it!
I'm trying to get the OP to at least get 255's on the rear! His 235's will sell fast on Craigslist!
(sorry...)
Last edited by Bally; Dec 28, 2016 at 06:09 PM.