Do bigger wheels require a recalib'd speedo?
Do bigger wheels require a recalib'd speedo?
I'm going to upgrade my 1985 Sport Coupe to 1LE brakes with the help of Steve Spohn. Since I need bigger wheels to clear the calipers will I need to get the speedo recalibrated? Thanks!
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Depends on the tire height. What was the old tire size? What size did you want to go with?
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From: Charleston, WV, USA
Car: '86 IROC-Z + Misc. project cars.
Engine: Supercharged + Nitrous TPI 355 CID
Transmission: Art Carr built Th700r4
That depends on the outside diameter of the tires. If the tire size you intend to use has the same or very close outside diameter to the tires that came stock on the car you will be fine.
For example:
The outside diameter of a 245/50 16 tire is about 25.9 inches.
The outside diameter of a 275/40 17 is also about 25.9inches.
So using either of these tires the speedo will read the same.
------------------
Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"
For example:
The outside diameter of a 245/50 16 tire is about 25.9 inches.
The outside diameter of a 275/40 17 is also about 25.9inches.
So using either of these tires the speedo will read the same.
------------------
Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"
- 355 cid
- AFR heads
- Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
- modified SLP runners
- TRW forged pistons/ceramic coated
- fully balanced
- Edelbrock headers/ceramic coated
- SLP cat-back
- Paxton supercharger
- Nitrous Express nitrous oxide
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