Tire pressure? By fairweasel2323 (Read 8,300 times)

[fairweasel2323]

???I am confused my manual is for a Fashion Sport but I have the Jonway YY250T-2 or known as Roketa Bali 250. In the manual it states 28psi in the front and 32psi in the rear, so thats what I have been riding them at so far have about 2800k on them, not sure if my odometer reads in km or miles but its at 2800. But my buddy pointed out my rear tire was looking bald, so I researched some more and found out I have the 120/70/12 front and 120/90/10 rear. Not the 110/90/12 and 110/90/10 it states for both tires in the manual. I dont think I have the correct manual? Then I read on the V.I.N Badge it says the correct size tires and says 32psi front 36psi rear, but both the front and the rear tire has a 36psi cold max psi rating, there the stock Cheng Shin tires. My dad said if thats what the scoot says go by it instead of manual, but was worried about putting the max psi in the rear. The front tire still looks good running it at 30psi but the back well heres some pics see what u guys think any advice will be greatly appreciated as I would like to prolong the life of the tire as long as possible. Thanks Bob

Back Tire




V.I.N states 32psi front 36psi rear but 36psi is max psi rating

[Alleyoop]

I would go what the Tire says max MINUS 10%-15% of that. Max is a little hard riding.
Alleyoop

[fairweasel2323]

thanks allyoop! I was thinking of trying 30psi in front then move the rear up to 34psi to keep the 4pounds difference from the front to back. Im not good with math but 10% of 36 is 3.6 so I would want 33.6psi so 34psi should be ok? And did u think the tire looked pretty worn thinking the roads I ride on could wear it down since there all mainly back roads instead of paved they are just (trying to think of what they call it) where they lay out some tar then spread stone over top then brush the loose gravel to the side of road not very smooth!

[jhbietz]

In my opinion I would replace the tire. Motorcycle superstore sells them for less then $30.00. When they get worn down they seam to have blow outs easier. That's no fun at speed!

[Bong]

^^^^Even less fun to push home

[fairweasel2323]

just seems like it shouldnt be worn that fast its less then a year old! I bought brand new memorial day last summer. The odometer reads 2,800 not sure if thats 2 thousand and 800 miles or KM, but everyone I have talked to has said it shouldnt have worn that soon. I have only done two oil changes besides the break in period 300mile change, so 3,000miles all im going to get out of that tire? My 150 had originals on it with 7,800 miles and my front one still looks fine like brand new still!

[fairweasel2323]

Mar 21, 2011 14:06:59 GMT -6 jhbietz said:

In my opinion I would replace the tire. Motorcycle superstore sells them for less then $30.00. When they get worn down they seam to have blow outs easier. That's no fun at speed!

yeah I know its cheap just trying to figure out why it wore so fast with less then 3,000miles and less then a year old? Was I running to high of pressure that it wore down the middle? the sides still have some of the tits on it and front is brand new looking still! My 150cc has 8,000miles and its tires still look brand new and there the Chinese Cheng Sen tires just like my 250cc? If it was the front wore I would just replace it and not worry much but changing the back is alot harder to do then just a straight axle looks like the exhaust, brake, and whole CVT have to come off!

[jhbietz]

Really not that hard to change. We will all walk you through it. Would rather help you then have you suffer a crash due to a blowout. JR had some good recommendations for for replacement tires.

[fairweasel2323]

thanks to all! I think I have figured out the air pressure I want to use Allyoop and several others have suggested to run 10-15% less then the max rating so 10% less then 36 was 32.4 which the manual suggested and 15% less is 30.6psi I ran 30psi in her and felt better going around curves then 32psi did so even though the front tire has a max rating of 36psi too if I go by the plate where its telling me max 32 front and 36 rear I get 28.8psi-27.2psi and I have been running it at 28psi and its wore fine. It most of been running 34psi in rear that wore center down fast. Hope it will last this riding season then get them replaced this fall with some nicer brand named tires! So for now going to run 28psi front and 30psi rear! Thanks for everyones help!

[mthomas]

That looks identical to my Lance Duke 250 and I just put new tires on mine. I bought Shinko 110/90-12 and filled them with the 41 psi rated on the tire.

[kiwiscoot]

Looking at your first photo, it seems like your tire has quite a flat area in the middle. That and the low mileage may be due to to low a tire pressure. M/c tires need to be run at higher pressures to keep the right rounded profile and give good service mileage. You have to remember it's only a 10inch wheels, it goes around a fair amount per mile. They don't last as long as others because of this and because they heat up more from the exhaust and higher rotational speeds.

[speedracer]

Looking at the pictures in any event you don't have many miles left on them. I would get rid of them ASAP. The second picture shows a groove which is worn down in the middle of that grove. Doesn't look safe to me.

[benellibob]

normally on a car tire, worn down in the center like that would be OVER-inflation, but since this is a rounded MC tire, that would be LOW pressure causing a wide section to wear, and wear faster. i run about 2-4 lbs less than the tire is rated for, during summer. remember heat expands everything including the air in your tires~!

never listen to the vehicle manual or vehicle badge. your tires are what matter, listen to them!

[fairweasel2323]

Mar 22, 2011 15:27:03 GMT -6 mthomas said:

That looks identical to my Lance Duke 250 and I just put new tires on mine. I bought Shinko 110/90-12 and filled them with the 41 psi rated on the tire.

They are identical scooters but I still got the Cheng Shins original tires with 2800 miles they are rated max psi cold at 36psi on tire, but my manual states 28psi front and 32psi rear, the max rating on the scooter is 32psi front and 36psi max. I think the wear came from only running 28-30psi in rear then since u guys are saying more pressure to not flat spot the rear like what has happened. So I should be running 28psi front and 32psi rear since I dont have no full load just me 120lbs? Then once I get the tire changed the new tires will have a better rating then just 36psi cold max on them, it will have the recommended psi for normal load on them too?

[fairweasel2323]

ok so if I use the 10% less then the max that would be 32.4 I will run the 32 thats 4psi lower then the max 36psi like benellibob suggested unless u guys think go ahead and run 34psi that would be 2psi less? But will be getting new tire for rear ASAP just want to make sure I dont ruin new tire either!! From reading all the comments sounds like I need higher pressure then the 30psi I have been running 2psi not much difference maybe run it at 34psi? Im worried about the max being 36psi but thats cold max rating so as long as im at least 2psi under it wont be to much pressure? I didnt want to have a blow out from too much psi! I dont think I have to worry about the load since im a small guy only weighing at 120lbs?