Tyre Mismatching
Tyres mismatching is a most important consideration factor because if two mismatch Tyres mount on same axle then Tyres life decreases 50%. Now i tell all about Tyres mismatching.
Types of Mismatches
- Tyre pattern
- Tyre Construction
- Size
- Air Pressure
- Non-Skid Dept
1. Tyre pattern
When we mount in a single hub a block pattern, and another is rib pattern type. In this way, this type of fitment called mismatching which is known as pattern mismatch. This type of fitment is not acceptable in single hub or multiple hubs.
Pattern should use: -
1.Lug to Lug
2.Rib to Rib
3.Block to Block
4.Rib Block to Rib Block
2. Tyre construction
When a nylon and radial tires are fitted in the same hub, the mismatch is called construction match.
Construction should use: -
- 10.00R20 to 10.00R20
- 295/90R20 to 295/90R20
- 295/90R20: -
- 295 is section width and 90 is the aspect ratio.
- 295mm section width
- 90mms is aspect ratio.
Height=265.5mms
2.10.00R20: -
10 is the section width and 00 is the aspect ratio.
- 10 is the section width and 00 is the aspect ratio.
- 10inch or 254mms
- 00inch or 000mms
Height=00mms or 254mms
That means 295/90R20 tires section height is not equal to section height of 10.00R20. Difference between both tires section height is 15.5mms.
3. Size
When tires of different sizes are mounted in the same hub, it is called size mismatch.
For better Tyre performance only use same size Tyres in dual mounting.
4. Air pressure
When there is difference of more than 5 psi between two Tyres, it is called air pressure mismatch.
Difference between both inner and outer tires is become +5 or -5 more than these values not acceptable.
5. Non-Skid depth
When Tyres having a difference of more than 3mm are mounted on the same hub, it is called NSD mismatch.
Overall diameter=+6mm or -6mm
Difference b/w=+3mm or -3mm
RTD (remaining tread depth) more from 3 is not acceptable.
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