Tyre Sizes - Rough Guide Thread

Awesome guys thanks for the advice,love the wheel/tyre combo you got there

Very useful thread, thanks!

I have a standard Jimny and I don't plan to lift it. I'm going to get a set of all terrain tyres (most likely Goodyear Wranglers or Yokohoma Geolandars if that makes a difference) and so I need to decide between 205/70s or 195/80s. I like the idea of going for a larger tyre, but by my calculation the total increase in diameter is just one inch (correct me if I'm wrong!). I was just wondering if this makes any appreciable difference offroad or not? And are there any real negatives? I've read the post about correcting the speedo and reving a bit lower at higher speeds (which sounds good!) but I was wondering if there are any other issues.

Thanks (and apologies if hijacking this thread was the wrong way to ask this question - I just thought it seemed relevant)!

my road tyres are 205/70/15 if that helps

215/75 R15 Hankook MT RT03 initial experience.

Tires fitted on standard 15x5.5 steels, balanced easily between 40 and 80 grams per wheel.

Look very nice.






On standard, bit sagging 13 year old suspension there is no rubbing, even at flex but it's quite close. Anti roll bar wasn't removed.

Haven't done a lot off road driving yet, but the tires seem to perform good, no wheel spins on wet dirt tracks, gravel and grass at road pressures. Need to test them more extensively, but so far I'm happy.

Road noise is minimal, all I can hear is a little hum at motorway speeds, but the car is noisy anyway, and I might not be very sensitive to tire noise, so your experience may vary.

They handle excellent on dry tarmac, and surprisingly good on the wet too. The car wasn't pushed into extreme, but they seem be better on the road then budget road tires it came with.

Ride is noticeably softer due to tire size with 26/23 psi front/rear despite stiff sidewalls (tire is LT rated). Chalk test showed even wear of chalk at 22-21/20-19 psi, but it seems a little low for road use so I'm running 25/22 psi. Might drop the pressure down for heavy rain and winter. Lower pressures didn't seem to affect the handling apart from making the ride even more comfortable, and using a bit more fuel. After some more mileage I'll check the wear and maybe adjust the pressure then.

Fuel efficiency didn't suffer much, unless on lower pressures. I'd say it's 5-15% drop compared to 205/70R15 road tires, but it's a rough estimate.

Performance dropped, mostly due to up sizing. Not very noticeably at town speeds, but acceleration from 50 to 70mph in 5th gear takes ages. Cannot compare to road tires, cause I didn't drive on motorways while having them on the car. Braking seems to be unaffected.

Conclusion: not really MT tire, more like aggressive AT, grippy, quiet and comfortable. Winter performance might be sketchy due to lack of siping, time will tell. I'm having high hopes for them to make a decent all season tire cause rubber compound is pretty soft, but it's too early to draw such conclusions yet.

Very nice, nice little write up too

Not many people have them here, or don't write about it. I bought them thinking of a cheaper alternative to BFG muds, after reading positive reviews from US and Germany.

Surprisingly the German tire vendors publish an EU label, which for this size is: fuel D, wet grip C, noise 73dB. Whether the EU labels can be trusted might be questionable, but it's better then most AT tires.

Another pic: