More tyre questions - bigger diameter on Jackaroo
Submitted: Tuesday, Aug 13, 2002 at 00:00
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Savvas
Guys, I've decided to stick with BFG A/T's when it comes to replacing my current set. However, I'm thinking about going to 265/70R16 instead of the standard 245/70R16 on the 3.5V6 Jackaroo. This will give me approximately an extra 14mm ground clearance (70% of 20mm). It also changes the overall gearing by about 3%. Has anyone done this with a current model Jackaroo? If so, what sort of performance and fuel consumption hits did you experience?
Reply By: Dean - Tuesday, Aug 13, 2002 at 00:00
Tuesday, Aug 13, 2002 at 00:00
Savvas, There has been alot of stuff on the overlander
forum regarding upgrading sizes and the ADR24, this is in regards to overall diameter, the overall diameter will change by more than 15mm, 28mm according to the BFG guide, needs to be checked with your insurance co., my insurance co. made it quite clear, if the tyres are illegal you will not be insured.
Dean
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Follow Up By: Savvas - Tuesday, Aug 13, 2002 at 00:00
Tuesday, Aug 13, 2002 at 00:00
Thanks Dean ... I looked a bit more into ADR24 and you are right about the 15mm. This basically means I can't go more than a 255/70R16, which is only a 7mm increase in clearance. If I did this, it will only be for looks rather than any appreciable gain in clearance. Mind you, taking into account treadwear which is down about 8mm, I'd be getting about a 10 to 15mm lift on what I have now!
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Reply By: Andrew - Tuesday, Aug 13, 2002 at 00:00
Tuesday, Aug 13, 2002 at 00:00
Savvas, theoretically you are right.. yes the TYRE will stand 14 mm taller, but the VEHICLE GROUND CLEARANCE will only increase by 1/2 that...ie 7 mm, because the axle is in the centre of the tyre radius.
Not a big net vertical gain for the increased rolling diametre the vehicle has to push around.
What is written on the sidewall is not gospel, it varies amongst manufacturers.
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Follow Up By: Savvas - Tuesday, Aug 13, 2002 at 00:00
Tuesday, Aug 13, 2002 at 00:00
Thanks Andrew ... In the diameter, there are two sections through the tyre, top and bottom. Each section will increase 14mm, therefore the tyre stands 28mm taller. But only half that 28mm will be a vertical gain, so in theory 14mm should be the increase.
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