Tyres - Rolling Resistance & Fuel Efficiency

jprboy

I'm looking at getting some new tyres and mulling over the rolling resistance scores.

All other things being equal, how much more efficient is say, a tyre of rolling resistance "B" compared to one with an "E" rating? Is it possible to give this in terms of a percentage and then work out the potential fuel savings over the lifetime of the tyre?

colm_mcm

They say A vs G will use around 7.5% less fuel max

It kinda adds an average of .12 l/100km as you go down each level.

As in a G would use 0.65 l/100km more than an A

Each car is different etc but those are the rough numbers Bridgestone are throwing out.


A rated tyres can be pretty bad for stopping distances though. 5th gear tested them before.

dingding

Is there much difference with the grip.

colm_mcm

The tyre companies are spouting about new magic compounds that have less rolling resistance, better wear, but also better grip.

jprboy

colm_mcm wrote: »

They say A vs G will use around 7.5% less fuel max

It kinda adds an average of .12 l/100km as you go down each level.

As in a G would use 0.65 l/100km more than an A

Each car is different etc but those are the rough numbers Bridgestone are throwing out.


A rated tyres can be pretty bad for stopping distances though. 5th gear tested them before.

Thanks, Colm.

Seems to be worth thinking about in terms of paying the extra when the potential savings are considered.

As for stopping distances, the tyres I was looking at had an "A" rating for the wet.

jprboy

dingding wrote: »

Is there much difference with the grip.

The tyres I was looking at had an "A" rating for the wet.

colm_mcm

I wouldn't buy into the whole money saving side of it tbh. Shelling out way more to get an extra 7km or so out of every tankful doesn't do it for me.

Remember the savings quoted are vs G rated tyres.