Going to smaller wheels MPG worth it?

[FaithfulDonkey]

Isnt the main consideration here the overall diameter of the wheel tyre combo?. If bigger than stock then will be higher geared and therefore potentially using lower revs for same speed (although not always true that lower revs = lower MPG as this depends on all that torque curve voodoo stuff). For me, retaining lower gearing is more critical for my off road stuff than filling the arches (and I actually quite like flashing a bit of spring in my lifted van!).

Anyway, probs the way we choose to drive will make the biggest difference of all to average MPG...

Id just go with whatever wheel tyre combo you like the look of or suits your usage and let the MPG sort itself out...fine margins and all that.

Then again, just ignore this...even I rarely follow my own advice!

FD

 

[DXX]

I’d be more concerned about the additional sprung weight of oversize wheels and tyres, combine that with a lowering spring that can hardly be called a spring at all and it seems like a either / and broken spring or worn bushes will result.

 

[Sasquatch]

Isnt the main consideration here the overall diameter of the wheel tyre combo?. If bigger than stock then will be higher geared and therefore potentially using lower revs for same speed (although not always true that lower revs = lower MPG as this depends on all that torque curve voodoo stuff). For me, retaining lower gearing is more critical for my off road stuff than filling the arches (and I actually quite like flashing a bit of spring in my lifted van!).

Anyway, probs the way we choose to drive will make the biggest difference of all to average MPG...

Id just go with whatever wheel tyre combo you like the look of or suits your usage and let the MPG sort itself out...fine margins and all that.

Then again, just ignore this...even I rarely follow my own advice!

FD

Diameter (and hence gearing), the various dimensions of the tyre and material hysteresis, intertia, frictional losses, even aerodynamics. A of factors at play, some quite significant.

 

[StratosFearXX]

I’d be more concerned about the additional sprung weight of oversize wheels and tyres, combine that with a lowering spring that can hardly be called a spring at all and it seems like a either / and broken spring or worn bushes will result.

Thinking about this, has anyone got a standard wheel and tyre they could weigh? There's one in my carrier but it's minus 5 and I'm not going grubbing about on the drive ...

I've got some 20s off the van with 265/40/20 on that I could easily weigh.

 

[DXX]

Thinking about this, has anyone got a standard wheel and tyre they could weigh? There's one in my carrier but it's minus 5 and I'm not going grubbing about on the drive ...

I've got some 20s off the van with 265/40/20 on that I could easily weigh.

I’ll weigh one tomorrow, got some kicking about in a bedroom.
For those who have also experienced steering rack / pump failure; the greater the rotating mass / rotational speed the greater the gyroscopic effect and the more force required to change the rotating axis of the wheels. More force requires more hydraulic pressure from the power assisted steering pump.

 

[DXX]

Thinking about this, has anyone got a standard wheel and tyre they could weigh? There's one in my carrier but it's minus 5 and I'm not going grubbing about on the drive ...

I've got some 20s off the van with 265/40/20 on that I could easily weigh.

A Devonport with a half worn standard fit 215 Cargo Vector is 24.6Kg.

 

[StratosFearXX]

A Devonport with a half worn standard fit 215 Cargo Vector is 24.6Kg.

Innovit Vector 2 with 265/40/20 Goodyear Asymmetric 3 tyres - part worn: 25.7kg.

Thought the difference would be greater. Interestingly my 8.5j and 10j wheels weigh the same (bathroom scales).