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Correction to increase the diameter of tires
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- Posts: 310
- Thank you received: 79
- Points: 5.00
24 Jul 2016 14:09 #170439
by gus2000
Gustavo LU2HC - Rio Cuarto (Argentina)
Jimny 1999 - 1.6 16V - SOHC
Correction to increase the diameter of tires was created by gus2000
Changing the tire diameter and scrub Radius alteration
The scrub radius is the distance in front view between the king pin axis and the centre of the contact patch of the wheel, where both would theoretically touch the road.
Increasing the diameter of the tire, the scrub radius is reduced by changing the dynamic behaviour of management. Producing abnormal behaviour, vibrations and instability
With Factory tires, the scrub radius is 15.7 mm
With 29" tires (205/80/16) pivot radius is reduced to 7.5 mm
White Original tire, yellow 29 “
To correct this, is necessary to place 8.2 mm wheel spacers
Suitable thickness aluminium spacers (waterjet cut)
Fixing
And a cut at the end of the mudguard to avoid interference between the wheel and the Fender
Note: This corrects the "scrub radius" but changes the working position of the wheel bearings and can slightly reduce the life of these.
As other data, wheel bolts fall short, they are removed
Nissan wheel bolts (screw identical measure, longer)
But with spline of 13 mm, as opposed to the 12 mm Suzuki
The scrub radius is the distance in front view between the king pin axis and the centre of the contact patch of the wheel, where both would theoretically touch the road.
Increasing the diameter of the tire, the scrub radius is reduced by changing the dynamic behaviour of management. Producing abnormal behaviour, vibrations and instability
With Factory tires, the scrub radius is 15.7 mm
With 29" tires (205/80/16) pivot radius is reduced to 7.5 mm
White Original tire, yellow 29 “
To correct this, is necessary to place 8.2 mm wheel spacers
Suitable thickness aluminium spacers (waterjet cut)
Fixing
And a cut at the end of the mudguard to avoid interference between the wheel and the Fender
Note: This corrects the "scrub radius" but changes the working position of the wheel bearings and can slightly reduce the life of these.
As other data, wheel bolts fall short, they are removed
Nissan wheel bolts (screw identical measure, longer)
But with spline of 13 mm, as opposed to the 12 mm Suzuki
Gustavo LU2HC - Rio Cuarto (Argentina)
Jimny 1999 - 1.6 16V - SOHC
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- OllieNZ
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24 Jul 2016 15:01 #170442
by OllieNZ
Replied by OllieNZ on topic Re:Correction to increase the diameter of tires
Very useful info thanks for sharing.
I have stock alloys with a 5mm offset and fitting 235/75 tyres made my wobble @ 45mph go away.
I have stock alloys with a 5mm offset and fitting 235/75 tyres made my wobble @ 45mph go away.
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24 Jul 2016 15:18 #170448
by Busta
Replied by Busta on topic Correction to increase the diameter of tires
Great stuff! Nice to see someone doing the maths and explaining so clearly the things that many of us don't understand.
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24 Jul 2016 17:33 - 24 Jul 2016 17:34 #170462
by X8GGY
Replied by X8GGY on topic Correction to increase the diameter of tires
Ummm, are we saying that this scrub radius can contribute to the "death wobble" then?
Can someone then calculate what wheel spacing we would need for 30" and 31" diameter tyres?
I'm running 31"s on the blue Jimny with ET-30 wheel offset and 30"s (235/75/15s) on the red Jimny with ??? alloys on?
Can someone then calculate what wheel spacing we would need for 30" and 31" diameter tyres?
I'm running 31"s on the blue Jimny with ET-30 wheel offset and 30"s (235/75/15s) on the red Jimny with ??? alloys on?
Last edit: 24 Jul 2016 17:34 by X8GGY.
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- Posts: 310
- Thank you received: 79
- Points: 5.00
24 Jul 2016 23:46 #170483
by gus2000
Gustavo LU2HC - Rio Cuarto (Argentina)
Jimny 1999 - 1.6 16V - SOHC
Replied by gus2000 on topic Correction to increase the diameter of tires
Gustavo LU2HC - Rio Cuarto (Argentina)
Jimny 1999 - 1.6 16V - SOHC
The following user(s) said Thank You: kirkynut, gusthegorilla
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