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Old 03-07-2013, 10:02 AM   #1
what car?? OP
down the road
Joined: Dec 2010
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tire question

I am currently in Quetzeltenango, Guatemala and looking for new tires. I did find some at a local vendor; my question is this, for a 2010 990Adventure can you mount up a rear tire that is a 120/90/18 instead of the normal 150/70/18 size? What should I expect if I go this route? The tire is a Pirelli tire, don{t see how that makes a difference, but it{s also an aggressive motorcross type tire, cannot remember the model. Let me know experiences and possible expectations, thanks.

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Old 03-07-2013, 10:41 AM   #2
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well, NOOOOO unless your only other choice is to ride on the rim. If you have to though, make sure you take the turns very slowly.
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Old 03-07-2013, 02:33 PM   #3
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Not gonna be a good fit. If it beads up it will be Square
Topes never seem to make me go any faster.
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Old 03-07-2013, 02:54 PM   #4
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You can order a tire up from GC, get something decent and the rught size.
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Old 03-07-2013, 06:51 PM   #5
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double check the sizes, that seems a bit odd for a size. It should be 120/100-18 which would be OK on the super enduro but would be very marginal (i.e. they(Pirelli and KTM) wouldn't recommend it as a fitment as it's putting a tire designed for a 2.15-3.0" rim on a 4" rim). it might fit but the load rating would be very low and it would be sketchy handling. a 140/80-18 would be closer but still not great, or stick with the OE size.

if it truly is a 120/90-18 then it's even worse than the 120/100-18 (lower profile, so worse fit on anarrower rim)
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Old 03-07-2013, 06:57 PM   #6
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120/90x18 is not an odd size, it's very common, and I would NEVER put that size of tire on a 4" rim

D606 Rear: 120/90/18 C16 Rear: 130/80/18

Get fit. Stay safe. Enjoy life. Learn something to help someone in need.
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Old 03-08-2013, 02:03 AM   #7
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If it is really a motocross tyre you can mount it, because the measuring method is different to normal enduro tyres, if not stay away from it.
The 120 motocross is a 140 enduro width and 140 works well on the 4,25" rim, not allowed but good also see: max. for 140/80 is 3,5"rim.
measuring method enduro <-> motocross explained on michelin site:

I only mount cross tyres (Michelin AC10, Mitas C02) when I go to the Enduro Park Ampflwang, works fine there but not on the way to the park on asphalt, really They also dont last long on the 990 (one day in the park, + 80km asphalt to get there and back home = EXPENSIVE) but the face expressions of the EXC riders when you ride the 990 through mud holes or climb steep hills is worth it
We blew it
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Old 03-08-2013, 05:17 PM   #8
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Joined: Dec 2010
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Thanks for the information!! I greatly appreciate it, I'm not sure what GC. I eventually found a tire that was in my size, Kenda Big Blocks surprisingly! I had a pair of those before I left the states. Wore quite a bit faster than my Mefo's but hey, no worries at least I'll have peace of mind and a tire that I'm familiar with. Thanks for all the information and replies, awesome!!

Cheers and pints all around.
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