What tire should you use?
There are as many opinions about tires than they are pilots on the road. What tires to get? Well, it depends. This FAQ will not go into the trap of recommending a particular set.
Here is an exhaustive list of tires, most of them with a size compatible with the 790 (it’s in French, just ignore the text). It goes from 10% off-road to 95% off-road. Each notch sacrifices a bit of road manner to improve some off-road capabilities. Make your own choice.
If you are really desperate, there is a thread about it on advrider.
Size, speed rating, load index, and factory fit.
The 790 Adventure R and Rally comes with Metzeler Karoo3 (Due to the M+S status of those tires, speed must be kept under 170km/h (106mph), as denoted by the ‘R’ speed rating in the tire denomination). The Rally version, due to its narrower rims and lack of air sealant, uses tubes inside those tires. The R version is tubeless.
- Front 90/90-21 M/C 54R M+S TL
- Rear 150/70-18 M/C 70R M+S TL
The 790 Adventure S comes with Avon Trailriders (Those are ‘V’ rated, up to 240 km/h – 149mph)
- Front 90/90-21 M/C 54V TL
- Rear 150/70R18 M/C 70V TL
Both share the same load index, 54 front, 70 rear, meaning a max weight of 212kg (467lbs) in the front, and 335kg (739lbs) on the rear. This should be plenty, and if you buy a new set, it must match or exceed those values.
For example (and this is just an example, not a recommendation!) the Motoz Rallz are available in the following size:
- Front 90/90-21 M/C 54Q TL
- Rear 150/70B18 M/C 70Q TL
Right size for the bike, and same load index of 54 and 70. Note that the rear tire is Belted instead of Bias ply for the Karoo3 and Radial for the Trailriders. But most importantly the speed is further limited to 160km/h (99mph) with these tires.
Using tubes on tubeless rims
On the front wheels, no issues in using tubes. On the rear wheel for the non rally models the valve is offset. A tube might work for a bit, but it’s not ideal, and may lead to the tube valve breaking. The only known way to solve this is to use the Motoz TUUOV 18-150-170, which has an offset valve (it’s also 4mm rubber, which is very very thick).
It’s all in the manual, and the same pressure for all models (The S manual doesn’t mention off-road)