guynecologist Posted July 4, 2013 Report Share Posted July 4, 2013 Looking at my owners manual for gen 7, Why the difference in tyre pressure for the 195/60R15 and 205/45R17, compared to the 205/50R16 and 205/55R15 Link to comment Share on other sites More sharing options...
planc Posted July 4, 2013 Report Share Posted July 4, 2013 Toyota will test all tyre size options until they find the best pressure for each, to give the best MPG, grip, even wear and emissions. Each size may even have a different recommended brand and model to each other. But given this, the recommendations may not suit your terrain, climate and driving styles. In Layman's terms, 32psi is a pretty good all round pressure for a Celica whatever the size, brand and driver. Link to comment Share on other sites More sharing options...
Mek Posted July 4, 2013 Report Share Posted July 4, 2013 I've never filled my tyres as high as 38 like it says for 205/45/17, the sticker on the door says 32 all round so never went above it really Link to comment Share on other sites More sharing options...
planc Posted July 4, 2013 Report Share Posted July 4, 2013 I've never filled my tyres as high as 38 like it says for 205/45/17, the sticker on the door says 32 all round so never went above it really 38 is for above 100MPH mate Link to comment Share on other sites More sharing options...
Akuma77 Posted July 4, 2013 Report Share Posted July 4, 2013 does that mean a 215 /45/17 is also the same pressure ? Link to comment Share on other sites More sharing options...
planc Posted July 4, 2013 Report Share Posted July 4, 2013 It's what I put in mine but my sidewalls are a soft construction so I put them up to 34 psi. Link to comment Share on other sites More sharing options...
James7 Posted July 4, 2013 Report Share Posted July 4, 2013 Wasn't this asked a week or two ago? Anyway the load rating will also influence the required pressure. Link to comment Share on other sites More sharing options...
daytona Posted July 5, 2013 Report Share Posted July 5, 2013 Presumably the lower the profile the higher the pressure as there is less tyre wall and air to absorb the potholes etc, but I stand to be corrected, again! Hadn't really considered it on the change to 215s so would be interested on definitive answer Kev? Currently 32 all round for 1 up mixed motoring. Link to comment Share on other sites More sharing options...
James7 Posted July 5, 2013 Report Share Posted July 5, 2013 I think it's more that lower profile tyres offer more support on stiffer sidewalls and to combat the edge wear that this would create, increasing the pressure would put more load into the middle band of the tyre. The width would also be a factor. And by that reckoning the 215's would be slightly higher again? Link to comment Share on other sites More sharing options...
alexpatrick86 Posted July 7, 2013 Report Share Posted July 7, 2013 I was going to ask this too at some point, what should the pressures be for 215/45/R17's? Link to comment Share on other sites More sharing options...
Akuma77 Posted July 7, 2013 Report Share Posted July 7, 2013 well guys when i had the tyres done yesterday they did them at 34 and they feel great Link to comment Share on other sites More sharing options...
izzzzythedog Posted July 7, 2013 Report Share Posted July 7, 2013 its to do with the angle and quantity of the plys within the tyre if you really must know , the sidewall of a tyre works as a shock absorber , get the pressure wrong and that bad boys gunna flex or have its profile altered ( bowing toward run flats ) and thus will have reduced grip , more likelyhood of aquaplaning and increased tread wear Link to comment Share on other sites More sharing options...
James7 Posted July 8, 2013 Report Share Posted July 8, 2013 Yeah, when I bought the car the previous owner was running the pressures too low, there was no tread on the edges of the tyres, but still 3-4mm in the middle. Link to comment Share on other sites More sharing options...
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