Psi Confusion ...

[FURBAR]

The dealership who sold and Ist seviced my bike .. told me to ignore the manfacturers psi guide .. which is 27/8 rear - 26 front ... and put 31/32 rear and 28/29 front ..

Mainly caus of weighing 17 stone on a 2T 125 cc i imagine ..

And then you have winter psi recomendations ...

I don't know what to think .. i want a happy meduim between grip/wear/and handling ... and was about to order those dustcaps that indicate if psi is low ... but can't order them until i've learnt more ref above .. as they are pis percific caps ..

Any thoughts ...
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Fuk um !!

[TheDonUK]

Dunno about 125's but most of my 600's have been 37 front and 40/42 rear depending on luggage/pillion
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[Current Bikes - GSXR-750 K5 & C90-97 ] [Previous Bikes: Runner 125, YBR 125, GS500, Bandit 600, Hornet 600, ZX6R-99, C90-99, R1-99, XT600E-04, GSXR-750 K4, CRF250L '16]

[Derivative]

Sounds about right I think, my CG is 28 rear 25 front without pillion, 32 rear with pillion

I think the "without pillion" is based on a guy about 12st so you want to go up a little.

[FURBAR]

Yeah, two of these .. one for each wheel should suffice, alerts at 28 psi ...

https://cgi.ebay.co.uk/MOTORCYCLE-TYRE-PRESSURE-ALERT-VALVE-CAP-PSI-29-30-PSI-/170532271516?pt=UK_Motorcycle_Parts&hash=item27b483f59c

Doe you deflate in winter ... ?? and if so .. how much ..
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Fuk um !!

[Welshd1k]

never deflated for the winter. it kinda does it it self.

cold air is less dense than warm air.
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

[Acemastr]

PSI shouldn't be a standard form, it's different for each tyre, each bike. My Michelin Power Pures on my CBR600 are running at 36/36 right now, most people would instantly say 36/42.

Find what works best for you
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2017 KTM 350 XC-F - 2014 Yamaha R6 - 2005 Yamaha YZ125
2016 Toyota Tacoma Limited

[SamJL]

[Skudd]

[FURBAR]

Thanks .. gona try 30 rear .. 28 front ...
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Fuk um !!

[Acemastr]

[SamJL]

Feels awesome 30/30, I had it 34/36 and the rear didn't feel to good, so lowered it to 30!

I've pretty much tried all different PSI configurations and 30/30 is best for me and my bike

The only bad thing is that the tyre tends to wear a bit quicker with less PSI!
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2009 CBR1000RR
2004 KTM 200SX
2004 KTM 65SX

[Codemonkey]

[SamJL]

[Wafer_Thin_Ham]

[Welshd1k]

argh you know what i meant. the tyre will look deflated when the air is cold.


whats teh word for it ummmm the volume? i dont fucking know
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

[SamJL]

The tyre won't look deflated, its how it feels when your riding.

A tyre with 20 PSI will still look fully inflated!

PSI is something you have to decide on really mate. My reccomended PSI is 36/42 but I run 30/30 because thats what I prefer. Try different combinations, and just find the one that best suits you. Just because someone reccomends a certain PSI doesn't mean that it will work for how you ride. I'm very agressive on the front end of the bike, and 30psi offers me more grip, so thats what I went for!
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2009 CBR1000RR
2004 KTM 200SX
2004 KTM 65SX

[Welshd1k]

well i remember ins chool filla baloon with air put it in a fride and it 'deflates' pull it out and back to room temp and it goes bqack inflated. to do with the atoms or some bs moving around hells so long back i cant remember
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
Sold >,zxr400 h2 (33bhp kit) rd350 n1 rd350 lc2<

[SamJL]

Yes, pressure increases as the air gets hotter, so PSI goes up. You can fill them with Nitrogen from most tyre places, this will stay at the same PSI regardless of heat.

Thing is, on a 125, your not going to get the tyres as hot as you would on something like a 600 or 1000cc bike, so you might want to start with quite a high PSI!
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2009 CBR1000RR
2004 KTM 200SX
2004 KTM 65SX

[woll]

[FURBAR]

Yeah, My Bros triple had new tyres not that long back, and there quite worn now compared to mine ...

Gotto love the 125s .. ...
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Fuk um !!

[Acemastr]

[FURBAR]

Mines on about 2500 km ....
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Fuk um !!

[2wheelsteve]

28x28 unless otherwise recommended, carrying luggage or a pillion or your just a big fatty haha
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Ride Safe

[FURBAR]

I'm seventeen stone mate, but i am 6,6 .. and often carry large amounts of take away ... have just bought 2 cargo nets for that very purpose ...
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Fuk um !!

[2wheelsteve]