Tyre pressure

[Mark65]

Well i e-mailed michelin to obtain the recommended pressures for my new pilot sportys on my ybr and they have replied with 23psi front and 26psi rear, is that right as it seems a bit low, i have 24psi front a nd 38psi rear atm like i had before, im not sure what to set them at now lol. Any ideas as i cant see them being that low.

Mark
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650

[TUG]

should be 25 29 solo 25 and something redicoulously high over 90kgs for a ybr125, i used their site once to get tyre pressures for my FZR and my tyres where shagged in weeks.
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Haz ER-5, innit!

[Mark65]

Hi lonewolf

up to 41 psi according to the manual for my weight but is that only for the oem tyres?, i ran the oem at 38 on the rear and have the pilot sportys at 36psi. 26 as they said seems pretty low. I will try 24f and 36r for a bit.

Mark
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650

[neil.]

I'm a fat git and run my City Demons at 25 on the front and 41 on the rear, in accordance with the manual for the YBR (2005 version), rather than tyre manafacturer's guidelines. Never had a problem with grip or control.
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CBT February 2008 | A2 June 2008 | Yamaha YBR125 (written off) | Honda CBF125 (current)

[Blackwolf]

It should state the pressures on the tire wall no?
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Current: Ducati Multistrada 1200s

[plugger147]

[Acemastr]

i run the sportys on my ybr at 23 and 28.

They are currently a little too high and it's made the handling terrible, can't even begin to imagine how crappy your handling must be.
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2017 KTM 350 XC-F - 2014 Yamaha R6 - 2005 Yamaha YZ125
2016 Toyota Tacoma Limited

[Mark65]

Actually at 36-38 rear they feel great as i am 112 kg so i think any thing below 30 would be to soft for me. they do warm up very quick and are a lot warmer after a ride than the cheng shins were.

Mark
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650

[Acemastr]

that'd probably do you then, as i'm about 62kg's. great tyres, made the bike handle so much 'stiffer' too, i must be so close to a knee down but having trouble with the last few mm's of chicken lines.
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2017 KTM 350 XC-F - 2014 Yamaha R6 - 2005 Yamaha YZ125
2016 Toyota Tacoma Limited

[MarJay]

So wait a minute... you emailed michelin, and they responded and you still aren't using recommended pressures? They should know, they will have tested THAT tyre with that bike, therefore they'd be the one I'd go for to be honest. If you don't like the handling you can always pump 'em back up can't you?

Different tyres have different sidewall stiffnesses, and therefore require quite different pressures. OEM tyres might need high pressures, and aftermarket ones might not. Take for example the Dunlop D207's on my old Buell. They needed higher pressures than the Pirelli Diablos I replaced them with. Pirelli said run 2psi less than OEM and it worked beautifully.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[TUG]

Sorry marjay, but i used their recomended tyre pressures for my FZR400 when i had one of their tyres on the back and i destroyed it in a few months, bald down the middle as the pressure was far higher than the one yamaha recomended in my manual...
I've done 2 ybr125s at work today mark, 25 front 41 rear if over 90kgs. I'd use that as i always do... regardless of tyre.
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Haz ER-5, innit!

[MattHirst]

Hang on, your running 14psi more in the rear than the front?

You should always run a lower pressure in the rear as it will get quite a bit hotter than the front. As the tyre gets hotter the pressure increases. So when they are both upto temp (with the rear being hotter) they should have nearer equal pressures.

I run 28 front and 24 rear on my goldspeed SM cut-slicks as reccomended by the bloke a the shop, i was confused as i always thought you ran a higher pressure in the rear. But after some research it turns out i was wrong.
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It's all fun and games until someone gets hurt, then it's bloody hilarious!!!

[TUG]

Matt, just wtf... thats all i can say, what you just said makes no sense to me at all as i've only ever put more pressure in the back tyre on every bike i've worked on or even to the front ZX-12R 41,41 for example.

I dont know about your DRZ but i'd check your manual to put the correct pressure in.

Dont you think manufacturers know that tyre pressures change with heat? They recomend you a pressure for a reason...
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Haz ER-5, innit!

[TUG]

[Mark65]

holy bat shit batman, this is gettin crazy lol, i emailed michelin again to tell them my weight to see if they have a higher pressure for that but i will try the lower setting tomm or mon just as a test. After perusing many bike forums i dont think i saw one that had a front higher than a rear, the only thing that came close was track settings and the occasional equal pressures.

Mark
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650

[TUG]

Track is different from the road though isnt it?
Its upto you, but i would just use the ones yamaha or manufacturer had given me... call me sinical but i think its better from my experiences of using tyre boys pressure that where wrong and killed my tyres in months...
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Haz ER-5, innit!

[Mark65]

Hey lonewolf
I did try the rear at around 34 before i moved to 38 but found it felt squeshy on the corners but i will give it a try at 26 lol but i dont think it will be any good, i know my front goes skittish above 25 psi, i rode it friday to work at 38 and it felt great.

Mark
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650

[TUG]

try 41 in the rear you said your weight is above 90kgs, what setting is your suspension on at the back? that will make a huge difference to handling too if not set to your weight.
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Haz ER-5, innit!

[Mark65]

I have the rear suspension at 4 out of 5 i think it is, fairly stiff for my weight, maximum pressure on the tyre side wall is 41 psi at 250kg if i read it right.

I will take a piccy of the tyre tomm and post it to show the wear pattern.

Mark
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650

[TUG]

The only problems i've had is a customer saying to me, "my bike isnt to confidence inspiring round corners" normally they have 41psi and they are deffo not over 90kgs and after i set they're pressures to 29 on the rear their complaints stop.

I've always set tyre pressures to spec, never had a customer complain its incorrect or twitchy round corners.
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Haz ER-5, innit!

[Mark65]

Piccys
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650

[MattHirst]

[binge]

[Villers]

42/42 on the Busa Anything lower on the front or rear and it all goes wobbly. I wouldnt dream of having less pressure in the rear than the front when Im transferring all the weight of me and the bike amplified by by acceleration.

I don't think the set up of racing SM's translates onto the road if I'm honest
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RS125 > CBR6 > SV650S > ZX636R > GSX1300RZ Hayabusa > 06 RSVR Mille > SV1000S > Street Triple 765 RS

[Blackwolf]

but there are huge differncs between racing temp. of tires and a quick paced road ride. ok so the tires heat up a little bit, yes pressure increases. you get to traffic lights tires get cold loose all extra pressure...
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Current: Ducati Multistrada 1200s