TPS Readings

[sheriff]

hi fellas
I'm not sure if this is the right section to put this query in but who cares as long as i can be with friends,here goes i decided to check the Tyre pressure on the GTR and noticed they were a little off 39.5 front 38 rear so i duly popped to the local garage to fill up to the correct level now i know some times garage air machines cant be trusted so when i got back home i checked the pressure with my new digital gauge one thing i bought that her in doors doesn't know about. (note to self password protect this forum)..anyway i checked the tyres and they both read 42.5 front/rear so i thought great job done. any way i left for work at about 3 that same day for my trip of about 20 miles into Theale more than enough time for the tyres to warm up, during the journey i checked the on board TPS reading at various times and it read 46 psi front and rear i was a bit concerned so when i got to work checked them again with the gauge both reading 42.5 now am i right in saying the on board one is just for guidance only and not to be trusted or is there a fault or even its right and my new gauge is wrong.
any offerings of advice or other wise will help.also counting the days until we all meet at the GTR Rally

ride safe

tony

[Boomer]

The TPS readings should be pretty accurate when the tyres are cold.
When they warm up the usually rise 2-3 degrees.
They are not intended to be accurate. They are there to warn you if you have a puncture.

I've had one and getting the warning allowed me to limp to a Tyre place before total deflation.
However the tyre place was a useless waste of space so I still ended up getting RAC-ed home.
The warning kicks in when either tyre drops below 36psi.

[Winston Smith]

Mine are spot on - As George says, when the tyres warm up the pressure increases.  Mine reads about 2-4lbs high when warmed up (44-46lb)

[Lonewolf]

Same as Winston, when my tyres are warm, the reading is usually 44 or 45psi. Then it never moves until the tyres are cold again.

[sheriff]

thanks guys for the info now i know that with them rising a few psi is nothing to worry about note to self read the manual lol still better to ask you knowledgeable fellas than find out the hard way i guess

[Kwikasfuki]

Yup, mine is +1 to +2 out. It is useful for knowing when you have a puncture as below 36 PSI the red light starts flashing (I think). Managed to limp to a petrol station, but couldn't get the inflater on to the valve stem. Rode home and by the time I got back tyre was on 12 PSI. I always carry a right angle adaptor stem now

[sheriff]

hi NB
sounds like a bit of good advice so i have just ordered myself one off flea bay also bought myself a mini compressor as well small enough to pack when i venture out many thanks again for the info
cheers
tony

[Lonewolf]

Sheriff, where did you get the mini compressor from? I know you can get the small brass coloured cartridges for re-inflating your tyres, are they any good, I've never actually used one? I think they just screw onto the tyre valve and blow the tyre back up, possibly :-\

[fatharry]

suspect that those brass coloured cartridges wouldn't fit? as there is very little clearance...... I just carry one of those angled valve extensions and on long journeys, tyre weld and a mini normal bicycle pump...cheap and effective, just needs a little elbow grease

[Kwikasfuki]

By those brass cartridges do you mean those that come part of a motorbike roadside puncture repair kit? If so, each cartridge gives about 4psi. Be careful when using cause they go ice cold in a second.

The ones I purchased from HG fit

[Lonewolf]

By those brass cartridges do you mean those that come part of a motorbike roadside puncture repair kit? If so, each cartridge gives about 4psi. Be careful when using cause they go ice cold in a second.

The ones I purchased from HG fit

Yeah they are thre ones I meant. Am I missing the point here, whats the point of only having 4psi?  :o

[Andy]

£2.40  :) http://cgi.ebay.co.uk/NEW-MOTORCYCLE-MOTORBIKE-TYRE-VALVE-EXTENSION-ADAPTER-/320560744633?pt=UK_Motorcycle_Parts&hash=item4aa2e8c8b9

Incidentally I can recomend Gary in Reading, Bassingstoke area etc. for tyre fitting  :)

http://www.gsmotorcycletyres.co.uk/

[Kwikasfuki]

By those brass cartridges do you mean those that come part of a motorbike roadside puncture repair kit? If so, each cartridge gives about 4psi. Be careful when using cause they go ice cold in a second.

The ones I purchased from HG fit

Yeah they are thre ones I meant. Am I missing the point here, whats the point of only having 4psi?  :o

I reckon you need to get the tyres up to 20psi before finding a petrol station, so you you need to use 5 of them in an even of a puncture. I wonder if there are any that have more PSI.