Rim, front 2.15 x 21"
Rim, rear 4.25 x 17"
Tyres, front 90/90 - 21 54V
Tyres, rear 150/70 - 17 69V
BMW Recommended Tyres:
Front: Michelin Anakee, 90/90-21 M/C TL/TT (54V)
Rear: Michelin Anakee C, 150/70 R17 M/C TL/TT (69V)
Front: Bridgetstone Battlewing 501 G, 90/90-21 M/C TL/TT (54V) COMES AS STOCK
Rear: Bridgestone Battlewing 502 G, 150/70 R17 M/C TL/TT (69V) COMES AS STOCK
Front: Metzler Karoo (T) Front, 90/90-21 M/C TL (54Q)* M+S
Rear: Metzler KAroo (T), 150/70 -17 M/C TL (69Q)* M+S
Front: Continental Twinduro TKC80, 90/90-21 M/C TL (54Q)* (Not manufacturered yet, go for the 90/90 54T model at present)
Rear: Continental Twinduro TKC80, 150/70 B17 M/C TL (69Q)*
* These tyres are rated Q (160km/h or 99mp/h) instead of V but can be used if "the permissable top speed is indicated by readily visible means (e.g. sticker affixed in the rider's field of vision)".
Tyres not mentioned by BMW:
The load index & size matches with slightly reduced speed rating are:
Front: Pireli Scorpion MT90 A/T 90/90 -21 TL 54V M/C
Rear: Pirelli Scorpion MT 90 S/T 150/70 R17 TL 69H
Front: Avon Distanzia AM43 90/90 -21 TL 54T
Rear: Avon Distanzia AM 44 150/70 R17 TL 69V
Front; Metzeler Tourance 90/90 -21 TL 54H M/C
Rear: Metzeler Tourance 150/70 R17 TL 69V
Front: Heidenau K60 90/90 -21 TL 54T M/C
Rear: Heidenau K76 150/70 B17 TL 69H M/C
What pressures should I run my tyres at?
For stock tyres:
FRONT one-up: 2.2bar/32psi at 20 degrees celcius
FRONT two-up and/or with luggage: 2.5bar/36psi at 20 degrees celcius
REAR one-up: 2.5bar/36psi at 20 degrees celcius
REAR two-up and/or with luggage: 2.9bar/42psi at 20 degrees celcius
A quick internet search will throw up correct pressures for alternative tyres. 2.2front/2.5rear seems to be common. On the road I quite liked 2.5front/2.9rear only one-up on the stock Battlewings.
Can I use Tubeless Tyres on the 800GS?
Yes, Tubeless tyres (TL) are fine. So are tube-type (TT) tyres. See Chart above. But either way you will still need a tube (see rim sizes above).
That's because the wheels have spokes and air will leak out if you don't have a tube. The 1200GS has special spoke that go to the side of the wheel so their owners can use tubeless tyres - you can't on your 800GS.
Do I need Rim Locks?
Probably not, unless you're planning to do the Paris-Dakar on the 800GS in which case you should know a lot more about tyres and tubes already.
How do I check pressures at 20 degrees celcius?
Set the climate control in your garage to 20 degrees celcius and only ever check your pressure in there.
OR...bear in mind that a change of 10 degrees celcius is equivalent to a change of about 0.07bars or 1psi. So on a near freezing day increase pressure by about 0.14bars/2psi or on a very hot Death Valley kind of day reduce pressure by 0.14bars/2psi. This applies to 'cold' tyres that haven't been ridden on recently, I have no idea how hot your tyres will be after a few trails.
Should I reduce pressures when off-roading?
If you're going on sand, gravel or very gloopy mud you can maybe lose 5psi/0.4bars but much less and you risk 'tyre slip' where the wheel spins but the tyre doesn't. This will result in the tube valve being ripped out and sudden deflation. You could deflate more and use rim locks (see above).
Put it this way: the BMW Off-Road schools runs their 800GSs off road at road pressures. 'nuff said.
If I want to repair a puncture out in the woods, what tools will I need?
Good grief thats a lot of stuff for a puncture? Isn't there any easier way?
- 22mm socket for front axel
- 24mm socket for rear axel
- a wrench for the sockets
- Torx keys for M8 and M10 torx bolts (front axel clamps and front brake calliper)
- Tork key for the ABS sensor if you are clumsy and might knock it when removing/replacing wheel
- A centre stand (or lie the bike down)
- A large rock/block to go under the engine when you want to remove the front wheel on the centre stand (or lie the bike down)
- Tyre levers (two or three, depends how good you are)
- Rim protectors or bits of plastic bottle (so you don't scratch the rims, depends how precious about your bike you are)
- A bead breaker (or thick heavy boot heal)
- Some 4"X4" or something to rest the wheel rim on while you break the bead with your boot, or you will knacker the sprocket/brake discs. Or you can dig a hole in the dirt.
- Valve removal tool (to take the valve out of the valve stem to deflate the tube enough to get it out)
- A little spanner (wrench) to remove the lock nut on the valve stem
- A puncture repair kit (patches/glue) or a spare tube
- A inflation device (CO2 cartridges, electric compressor or hand pump)
- Some prior knowledge of how to repair a puncture. Best to practice at home before you need to do it for real.
Yeah. Push bike to nearest road. Phone BMW assist.
Har Har. Can't I just plug the tyre?
No, its got a tube, remember? Should have bought the 650GS.
What about tyre sealant? Can I use that?
Bit late once you have a puncture. There are special formula sealants for tubed tyres. Messy stuff though, and it won't work on gashes or big punctures, but it will gloop everything up and make the tube irrepairable. Also, a small nail in the tyre can cause a large rip in the tube as the tube 'squirms' inside the tyre at speed.