Has anyone thought of using 4 'donut' tires?
 

I'm not sure if this has been proposed for an experiment in the past, but I'll ask anyways:

Has anyone tried replacing all 4 of their tires with the skinny "donut" tires that can be inflated to 75psi? Almost all donut tires are designed to last over 5,000km (3,100 miles) yet they are rarely used and can be found in junk yards for a song and dance.

Makes me think of how easy it is to pedal speed bikes with the skinny tires compared to the thick tires of mountain bikes. The thinner tires might improve aerodynamics too?

- Peakster

Ours Not as Good
 

That is a good idea, but from my experience with do-nut spares, the recommended distance is to last 50 miles and the speed is limited to 45 mph. I wore one out once because I had to work over a Holiday weekend and the tire stores were closed. The tread was nearly gone over about 125 miles and 55-60 mph.

I have wanted a lighter tire and less of a footprint to propel, but it just seems to be cost-ineffective right now.

RH77

https://www.lucasclassictires.com/

Portawalls would work, you would need wheels though, could be a challenge.

Changing to a significantly narrower tyre than what the car came with when new could encur fines from those blue guys and in some places ANY deviation from standard can get you a defect notice.

I think you would need to see how much it would increase the rpms for a given speed and see how that would affect the FE. The increase in RPM might cancel the other benifets.

I think 2 donuts in the rear might help a bit and be safer.

plus it would be easier to make rear wheel skirts :)

MMM -- donuts :D

Hi theclencher -¨and one pair of smaller and really skinny tires¨

In many countires missmatched tyres like this would result in a defect notice and/or a fine.
It may be law , but perhaps the cops may not be eager (or observant) to chase it up.

I remember our local chineese resturaunt owner had a brand NEW Benz , and he had some after market (but very high quality) mags and tyres fitted.
Perhaps it was racially motivated , perhaps not , but a cop stopped him and defected his car , giving him 7 days to change back to original equipment or go unregistered.

Okmulgee, Ok. is the only place in my life where Ive seen 4 donut tires on cars. You see this from the welfare crowd. its there last chance effort to stay ,oble around here. And it dosent last long. :)

U.S. not so much
 

I've seen cars that look like skateboards, Caprices with 22-inch chrome wheels, racing-only tires on the street, dark tint, etc. It seems like around here either you've committed a crime, look like a drug car, or are speeding to get busted. For state inspections (50-states, 50 different methods, some states no inspection at all) -- just take in the stock wheels (or here get a shop you know will pass you). The Police is generally pretty busy with other stuff.

Police Officers are out there putting their lives on the line, so I see it a bit differently.

RH77