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Old 11-01-2012, 09:16 AM   #691
rifles
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This has probably been answered before, but I'm running some Perelli mt90s on my 08 and I'm wondering what kind of tire pressure I should be using? I'm a 135lb midget in gear and carrying no other weight. Think 32/36 is high?
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Old 11-01-2012, 09:58 AM   #692
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Originally Posted by rifles View Post
This has probably been answered before, but I'm running some Perelli mt90s on my 08 and I'm wondering what kind of tire pressure I should be using? I'm a 135lb midget in gear and carrying no other weight. Think 32/36 is high?
Just my opinion and you know what they say about those....

For normal street riding 32/36 sounds about right however, you should adhere to the tire mnfct recommendations.

For aggressive street riding, I'd lose a few pounds.

For offroad, 32/36 is too much air. I personally, am in the 20's offroad, even less if mostly sand. I'm around 200lbs , BUT your Pirelli's are different. Different shoulder, Different tread pattern, than other tires.
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Old 11-02-2012, 01:48 AM   #693
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On my 2012 with stock Bridgestone TW303 tires the front recommended by the book is 18psi with rear 22. With passenger, it is recommended 22 front and 25, respectively. If your Pirelli's have the same dimensions as the stock tires, then the pressures should be about the same for road and light off road conditions. Most folks drop the pressure in the dirt and nasty stuff to 10-20 psi.

The rear is a tubelesss tire which should be fine with the lower pressures, however, running lower pressures in the front (with tube) can cause the wheel to separate from the tube and "spin" on the rim which could then pinch and puncture the tube. There are little "rim lock" devices are are designed to prevent this and if I were expecting to do lots of serious off road stuff, I would be investing in a pair of those.

I suspect that's one of the reasons that Yamaha chose to have a tubeless tire on the rear. Tubeless tires can carry more weight and are easier to patch (no need to remove the tire and wheel in most cases).

I have an SAE cable running from my battery to the trailing arm of the bike so that I can plug in my small electric air pump any time. It's a great little gizmo that runs less than $50 if I remember correctly from one of those online "has everything" moto supply joints. TOTALLY worth it IMHO. My tires lose air naturally from time to time and I hate having to ride out to the fuel station just for 5 psi of air!

Good luck!
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Old 11-02-2012, 02:02 PM   #694
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Originally Posted by FLYNLOMOTO View Post
I suspect that's one of the reasons that Yamaha chose to have a tubeless tire on the rear.
Good luck!
Does your xt250 have a cast wheel on the rear?
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Old 11-02-2012, 02:11 PM   #695
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My 2010 has tubes front and rear. I run 22-24 rear and 18-20 front. Off pavement, which is mostly what I do, I'll drop to around 15psi. No way do you need 36psi on this little bike. I replaced my stock bridgestones at 5500 miles with some tread left. I have about 3000 on my current michelin T63s and they are still in good shape. -al
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Old 11-02-2012, 03:53 PM   #696
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From what I can tell, the US model has a tube rear tire and outside the US has a tubeless rear tire. It is still a wire wheel, but it has a lip on the inside of the wheel where the spokes hook so they don't go through the rim.

Look at this rim
http://advrider.com/forums/showpost....&postcount=662
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Old 11-02-2012, 08:22 PM   #697
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Quote:
Originally Posted by rifles View Post
This has probably been answered before, but I'm running some Perelli mt90s on my 08 and I'm wondering what kind of tire pressure I should be using? I'm a 135lb midget in gear and carrying no other weight. Think 32/36 is high?

I run mine at 32psi front and 34psi rear for road use. Anything lower you may overheat the tires...not good.
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Old 11-03-2012, 04:59 AM   #698
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Originally Posted by LarryGee View Post
you should adhere to the tire mnfct recommendations.


Overview of Pirelli Front MT90 Scorpion AT 90/90S-21 Tire
2 Ply tread; Rated for speeds up to 112 mph
C-shaped large central knobs provide great stability, great traction and braking
Size-optimized carcass for excellent high-speed stability
Silica tread compound offers superb wet/dry grip, high mileage and regular tread wear
Developed for heavy usage (desert and sand) on new generation, big enduro bikes
Sidewall ID Information: Pirelli 90/90-21 M/C 54S Scorpion A/T

Dimensions:
Inflated Width /Measuring Rim Width: Not Available/2.15 in.
Inflated Diameter: Not Available
Acceptable Rim Width(s): 1.60/2.50 in.
Deepest Tread Depth: 9/32 in.
Directional Arrow: Yes
Speed Rating: S-Rated up to 112 MPH

Capacities and Construction:
Load Capacity/Inflation Pressure: 467 lbs/36 PSI
Tread Plies/Material: 2 Nylon
Sidewall Plies/Material: 2 Nylon
DOT approved for Road Use: Yes
Tube or Tubeless: Tube Type

Overview of Pirelli Rear MT90 Scorpion AT 140/80S-18 Tire
4 Ply tread; S Rated for speeds up to 112 mph
C-shaped large central knobs provide great stability, great traction and braking
Size-optimized carcass for excellent high-speed stability
Silica tread compound offers superb wet/dry grip, high mileage and regular tread wear
Developed for heavy usage (desert and sand) on new generation, big enduro bikes
Sidewall ID Information: MT90 140/80-18 M/C 70S

Dimensions:
Inflated Width /Measuring Rim Width: 6.10 in./3.50 in.
Inflated Diameter: 6.1 in.
Acceptable Rim Width(s): 2.75-3.75 in.
Deepest Tread Depth: 13/32 in.
Directional Arrow: Yes
Speed Rating: S-Rated up to 112 MPH

Capacities and Construction:
Load Capacity/Inflation Pressure: 739 lbs/35 PSI
Tread Plies/Material: 4 Nylon
Sidewall Plies/Material: 3 Nylon
DOT approved for Road Use: Yes
Tube or Tubeless: Tube Type

There you go....
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Old 11-03-2012, 08:19 AM   #699
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I still have the 16t front sprocket and the new in bag OEM yamaha locking tab that needs to be put on when replacing the sprocket, if anyone is interested, $25 shipped.

thanks.
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Old 11-03-2012, 11:09 AM   #700
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Quote:
Originally Posted by LarryGee View Post
For normal street riding .................., you should adhere to the tire mnfct recommendations.
Once upon a time, I believed this completely. I was buying tires for my Ford Ranger and asked them to use the higher inflation pressures and I was ready to go to war with the guy when he suggested lower pressures.

But when he said "This same tire and size, is used on many different vehicles, from my Ranger and up, including Suburbans and fill size trucks. You really should use the tire pressures the vehicle manufacturer recommends."

Me: "Oh." Even old dogs can learn new tricks.

That 140 size tire is used on bikes up to the BMW GS12 and it's larger that the 120 stocker on my 366 pound DR650 (22 front, 25 rear) on the street.

And: YMMV

Edit:
Quote:
Originally Posted by MEDIC-0372 View Post
I run mine at 32psi front and 34psi rear for road use.
Anything lower you may overheat the tires...not good.
Sorry, this is not true, see above. Use what Yamaha says.
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ER70S-2 screwed with this post 11-03-2012 at 11:15 AM
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Old 11-03-2012, 12:11 PM   #701
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Hi Guys n Gals,

here's mine now she's fully road legal.



Regards

Reggie
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Old 11-03-2012, 01:32 PM   #702
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Reggie,

That's a beautiful bike. I'd be afraid to get her dirty.
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Old 11-03-2012, 01:41 PM   #703
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Hi LarryGee,

Cheers mate.

That's what cleaning products and a trusty shed were invented for!

Regards

Reggie
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Old 11-03-2012, 07:41 PM   #704
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Oh man, that is one incredible looking bike. Love what you've done with it


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Old 11-03-2012, 07:55 PM   #705
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Bike looks great reg!
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