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Old 04-11-2013, 11:52 AM   #1
gspadafore OP
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Trials tire on 690???

I run a Dunlop 803 trials tire on my 300 2-smoker and flat out love it. Fairly new to my 690 and sometimes it scares me when the back end just skates across hardpack. I assume the trials tire will hold up in the dirt. My question is how fast will it heat up and destroy itself on pavement? Anyone have experience with this set-up?

Gary
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Old 04-11-2013, 12:01 PM   #2
shep546
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I know guys run them on their xr650r which has similar hp and torque as your 690...
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Old 04-11-2013, 05:12 PM   #3
MrHix
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A friend of mine ran an 803 out in Moab @ 70 mph for about 20 miles and lost the center 3 rows of knobs. It already had some dirt miles.

The Pirelli MT-43 will stand the street better but you will loose some of the real trials tire grip because of the compound & stiffer sidewalls.

I may try the MT-43 on my '12 690 later after my Heidenau K60 wears out. I have a friend that has a KTM/Thumper Racing 610 XC-W and he is using the Pirelli now. Not many miles, but he says it works well.

Cheers,

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Old 04-11-2013, 08:27 PM   #4
Idle
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I don't see why the mt43 wouldn't work. I like it on my berg, and have over 600 50/50 miles on it, it's about half worn. I'm going to run it until it is VERY bald just to see when/if it will lose traction.

You've seen this tread right? MT 43 dot yes!

http://www.advrider.com/forums/showthread.php?t=398746
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Old 04-11-2013, 09:23 PM   #5
spencergt66
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Mt43

I run the mt43 on my husaberg fe550 that thing has stupid power just put 400ds miles 50/50 highway off road mix still looks near new. I'm impressed I would t think to see it wear any more on a 690
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Old 04-12-2013, 04:41 AM   #6
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Quote:
Originally Posted by gspadafore View Post
I run a Dunlop 803 trials tire on my 300 2-smoker and flat out love it. Fairly new to my 690 and sometimes it scares me when the back end just skates across hardpack. I assume the trials tire will hold up in the dirt. My question is how fast will it heat up and destroy itself on pavement? Anyone have experience with this set-up?

Gary
I destroyed an 803 during one tank of fuel on my exc. I've found the mt holds up much better as well.
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Old 04-12-2013, 11:17 AM   #7
The Letter J
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I've run a rear MT43 on my 690 twice now, 1200-1400 miles until they were done. The second one developed some cracks in the carcass and some strange delaminating of the outer layer (?) of tread very early in it's life (<200 miles) but still lasted ~1200 miles. I have been told that was due to my lack of "heat cycling" but I don't plan to do anything different with the next one. I have 2 rear wheels so the trials tire doesn't stay on the bike full time except in the summer time.
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Old 04-29-2013, 09:08 PM   #8
Hoots
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Quote:
Originally Posted by The Letter J View Post
I've run a rear MT43 on my 690 twice now, 1200-1400 miles until they were done. The second one developed some cracks in the carcass and some strange delaminating of the outer layer (?) of tread very early in it's life (<200 miles) but still lasted ~1200 miles. I have been told that was due to my lack of "heat cycling" but I don't plan to do anything different with the next one. I have 2 rear wheels so the trials tire doesn't stay on the bike full time except in the summer time.
I've just put one on the back of my 2012 690, and at about 250km it has done the same thing - centre tread seems to be coming apart ...

I put 18psi for that first run - which was mostly hard gravel, with a bit of tar - a lot of it at speed ...

Should I be running a lower pressure on these surfaces ... ?

Tyre doesn't look as though it will last very long at this rate ...
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Old 04-30-2013, 10:52 AM   #9
The Letter J
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It seems like bumping up your tire pressure on the mt43 just makes it wear a lot faster with no noticeable benefit onroad. It wasn't until I had tried the higher pressure that I really noticed the cracking either. I settled on 11psi all the time and it gets pretty even wear, it sucks at hard cornering no matter what (onroad due to it's square profile, offroad due to its lack of widely spaced knobs for biting in) at least at lower pressures it handles straight lines well!
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Old 04-30-2013, 01:05 PM   #10
Hoots
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Quote:
Originally Posted by The Letter J View Post
It seems like bumping up your tire pressure on the mt43 just makes it wear a lot faster with no noticeable benefit onroad. It wasn't until I had tried the higher pressure that I really noticed the cracking either. I settled on 11psi all the time and it gets pretty even wear, it sucks at hard cornering no matter what (onroad due to it's square profile, offroad due to its lack of widely spaced knobs for biting in) at least at lower pressures it handles straight lines well!
Thanks LetterJ - I had wondered whether this was the case - counterintuitive, when used to pumping knobbies up a bit to prolong life on hard surfaces, but makes sense ...

What sort of pressure do you run for hard gravel roads / fire trails and the occasional transport leg on the tar ... ?

EDIT: sorry - I didn't notice the 11psi in your post

Hoots screwed with this post 04-30-2013 at 02:28 PM
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Old 04-30-2013, 02:33 PM   #11
The Letter J
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11psi 100% of the time. I've held it at 109mph (indicated, that's all it wants to pull with my big butt on it) for short stints (yes I know that is over the tire's speed rating) and it didn't explode!

I settled on this pressure the same way I set air pressure on all of my bikes by starting out at higher psi than necessary and trying lower pressures in 1-2psi increments until I have 4mm of "rim clean" from the hardest typical hit that the terrain has to offer at my riding pace... slower speeds will allow lower pressure with the same rim clean as will lighter riders/bikes. My GasGas 300 runs the same tire at 6-7psi with 4mm rim clean. Some people run more, some run less, but this has been working for me for 10's of thousands of offroad miles.
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Old 04-30-2013, 02:52 PM   #12
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Quote:
Originally Posted by The Letter J View Post
11psi 100% of the time. I've held it at 109mph (indicated, that's all it wants to pull with my big butt on it) for short stints (yes I know that is over the tire's speed rating) and it didn't explode!

I settled on this pressure the same way I set air pressure on all of my bikes by starting out at higher psi than necessary and trying lower pressures in 1-2psi increments until I have 4mm of "rim clean" from the hardest typical hit that the terrain has to offer at my riding pace... slower speeds will allow lower pressure with the same rim clean as will lighter riders/bikes. My GasGas 300 runs the same tire at 6-7psi with 4mm rim clean. Some people run more, some run less, but this has been working for me for 10's of thousands of offroad miles.
Thanks - I'll mine down to about the same level, and see how it feels.
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Old 04-30-2013, 04:33 PM   #13
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I used to run 6 - 8 psi on my KTM/Thumper Racing 320 XCF-W all the time. I did several 20 - 25 mile stints in Moab @ 70 mph with no problems. At those pressures, the tires keep flatter on the pavement (but they do squirm a little).

Cheers,

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