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Offroad tires reduced my top speed by 20 mph?!?!?!

5990 Views 24 Replies 18 Participants Last post by  01speed3
WHAT THE FCK

I just put Pirelli M21's on my 2008 WR250X.

The day I pulled in to have my tires swapped out, I went 106 with some whomp left over.

AS soon as I drove off the lot after my tires were installed, I checked my top speed...

85 MPH????

WHAT THE FCK

Did TIRES really reduce my top speed by over 20 MPH?
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ride a bicycle with skinny road tires, then put some knobby mountain bike tires on it. See which pair you go faster on. when youre on two wheels, tires make a huge difference.
speedo is off... taller tire..
Both of the above.
speedo is off... taller tire..
Tee Hee...speedo is off. Hope your tan lines don't offend:headshake
Check your speed with a GPS. You'll find that your speedo is off due to the taller tires as people above suggested.
Tee Hee...speedo is off. Hope your tan lines don't offend:headshake
:rofl:....:headshake
If it makes you feel any better, you weren't actually going 106 to begin with. :D
The knobbies do slow the WRx down, I experienced the same thing.
Just wait until you try to stop on wet pavement...
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Get the Hot Wheels radar gun for about $30 bucks at WalMart. It goes all the way up to 100mph and is super accurate.

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Get the Hot Wheels radar gun for about $30 bucks at WalMart. It goes all the way up to 100mph and is super accurate.

Damn you for reminding me of those... I'm so getting one!
Both of the above.
+2 both
Damn you for reminding me of those... I'm so getting one!
Used mine last week to measure how fast my boy was swimming across the pool.

Also came in handy to settle the argument of what could be thrown faster, a dart or a shuriken.
Also came in handy to settle the argument of what could be thrown faster, a dart or a shuriken.
Hahaha, best argument EVER!:arsenal
Also came in handy to settle the argument of what could be thrown faster, a dart or a shuriken.
And.........?????????
And.........?????????
Results of testing are classified, GS-15 level, need to know basis only.

No one was harmed, minor property damage did occur, but it was nothing that spackle couldn't fix.
Hey gents,

Speedo is not off. I checked with GPS. My top speed just got fcked in the a$$. Thats all.

managed to hit 87 on the highway, downhill, with wind behind me.

MPG got fcked too. Dropped from 81 MPG to 51 MPG on the same trip.


Handling off road is TEN TIMES BETTER though. Rides like a dirt bike.

Its a heavy compromise but I got what I wanted.

If there are any suggestions for getting AT LEAST my mpg better with the same tires please share.

KILL
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Are you saying you have a WR250X that goes 106mph confirmed by GPS and gets 81mpg?:hmmm:
Speedo is not off. I checked with GPS. My top speed just got fcked in the a$$. Thats all.

managed to hit 87 on the highway, downhill, with wind behind me.

MPG got fcked too. Dropped from 81 MPG to 51 MPG on the same trip.
Sorry my man. Calling you out on the 106mph with some "whomp" left over.

If you're saying you have a stock speedometer that's showing 106mph AND that a gps is showing the exact same number....you're just not telling the truth. Factory speedo is off 7.7%, and any changes to gearing or tires throw it off more.

Go here: click me please

Be sure to list any and all mods done to your wr250x.

If you were getting 81 mpg you were riding it like a grandmother going to church on Sunday too. Most people that actually ride the thing get somewhere in the 45 to 60 mpg range on a good day, and those people never see anything over 100mph with corrected speedometers or gps verification.

Now maybe if you weigh about 65 pounds, were drafting behind a 18-wheeler on the autobahn for 20 miles straight, going downhill, with a 30 mph tailwind, and on tires pumped up to about 100psi with a turbo kit installed you could manage 106mph....but even then I'd be skeptical.

Please post some pictures of your 106mph, 81 mpg capable wr250x, and list your mods.
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