pjc615ukuk Posted May 23, 2015 Report Share Posted May 23, 2015 (edited) Hi. My recently acquired '71 TR6 is running on Mabour General (never heard of them) 185x15 R tyres. Could anyone enlighten me to the correct tyre Pressures please? Edited May 23, 2015 by pjc615ukuk Quote Link to post Share on other sites
Sapphire72 Posted May 24, 2015 Report Share Posted May 24, 2015 Owners Workshop Manual recommends 22 lb/sq in Front/ 26 Rear. If you have a simple bicycle tire pump it is easy to experiment with different pressures. Many people run a bit higher, but try starting here. That's Topaz?, a nice period colour. Quote Link to post Share on other sites
TR NIALL Posted May 24, 2015 Report Share Posted May 24, 2015 26 all round. Quote Link to post Share on other sites
Steves_TR6 Posted May 24, 2015 Report Share Posted May 24, 2015 26 all round. +1 Quote Link to post Share on other sites
pjc615ukuk Posted May 24, 2015 Author Report Share Posted May 24, 2015 Forgive my stupidity, but these tyres aren't the original size,so would that not affect the psi? It's Saffron Yellow btw Sapphire '72 Thanks to all for replying btw. Quote Link to post Share on other sites
peejay4A Posted May 24, 2015 Report Share Posted May 24, 2015 Great colour Saffron, my 6 was the same. You'll find all sorts of opinions on tyre pressures on the forum. Mostly it's down to trading off heavy steering with lower front pressures - I found the handbook pressure far too low for comfortable steering - against unpredictable breakaway and a harsh ride if you go for higher pressures. I settled on 26 front and 28 rear on my 6 and that's what I now use on the 4A. Try varying it until you find a setting that you like and watch for uneven tyre wear which might arise from going too far in either direction. Quote Link to post Share on other sites
pjc615ukuk Posted May 24, 2015 Author Report Share Posted May 24, 2015 Forgive my stupidity, but these tyres aren't the original size,so would that not affect the psi? It's Saffron Yellow btw Sapphire '72 Thanks to all for replying btw. Quote Link to post Share on other sites
Denis Posted May 24, 2015 Report Share Posted May 24, 2015 (edited) The correct tyre size for the TR6 is 165 of course, and the original Hand Book states:- Up to 100mph (160kph) Front 22 lb/in (1.54 kg/cm) Rear 26 lb/in (1.82 kg/cm) Over 100mph (160kph) Front 28 lb/in (1.96 kg/cm) Rear 32 lb/in (2.24 kg/cm) Or in other words, the faster you wanna go stick more air in! And the more air you put in the fronts, the lighter the steering becomes, especially useful for parking if you've fitted a non standard, smaller steering wheel! Edited May 24, 2015 by Denis Quote Link to post Share on other sites
john.r.davies Posted May 24, 2015 Report Share Posted May 24, 2015 Get a tread guage. Note the tread depth across the tread from inner to outer shoulder, and repeat, monthly. Excess pressure leas to excess centre tread wear and vice versa. Also uneven wear inner to outer can show up toe-in problems. JOhn Quote Link to post Share on other sites
Steves_TR6 Posted May 24, 2015 Report Share Posted May 24, 2015 Get a tread guage. Note the tread depth across the tread from inner to outer shoulder, and repeat, monthly. Excess pressure leas to excess centre tread wear and vice versa. Also uneven wear inner to outer can show up toe-in problems. JOhn As John says, my toe in was in fact a couple of degrees out, soon chewed up half the tread on the insides. Steve Quote Link to post Share on other sites
stuart Posted May 24, 2015 Report Share Posted May 24, 2015 First of all check the dates on those tyres as I dont think they have been available for quite a while. If they are still in date i.e. less than 6 yrs old or thereabouts then I would try 24 front 26 rear and then using the same route around your local area as a test run try going up or down a couple of PSI each way until you are happy with pressures that suit your driving style. Stuart. Quote Link to post Share on other sites
OAF939M Posted July 11, 2017 Report Share Posted July 11, 2017 TR6 165 Continental Contact tyres. Doing a sprint at an airfield on Sunday. Normally put 30 psi all round for sprints, but wonder what you think.? Quote Link to post Share on other sites
john.r.davies Posted July 11, 2017 Report Share Posted July 11, 2017 (edited) Best way is to measure the tread temperature. If it's even across the tread, then it's correctly inflated for your driving style at that time. Best method is a probe-type one, a pyrometer, that you stick into the rubber, but they are costly. Next best is an infrared guage. Much less expensive, but only measure the surface, whih may have cooled by the time you get back to pits and paddock. But a lot better than nothing! Take the temps ASAP after to can get out, or before, if you have someone to to do it while you unstrap. Keep good records, so that you can consult them again. Something like the chart below, with date and weather notes, that I use. Your tyre pressure will rise, of course, as the tyre heats up, so a cold temperature allows you to predict what will happen on another day. Most manufacturers offer a guide figure for their tyres, but Continental are more cagey, and refer to the owner's manual. But for a starter, Continental offer this "Technical Data Book" compendium: https://blobs.continental-tires.com/www8/servlet/blob/85806/30cec2cae7fa004e1eae3b0f560e449f/download-technical-databook-data.pdf Look up your tyre - Continental Contact 5? 6? size. You quoted "165" but x what? That last figure is the wall height, and you need it to consult the right table. EG 165x65x15 (15 is the wheel rim diameter) on p33 Find the Load Index there and then consult the tables on p104 et seq. for which pressure to aim at between 2-2.5bar (29-36psi). That's HOT, remember! Or just start with 30 and see where you go! John Edited July 11, 2017 by john.r.davies Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 11, 2017 Report Share Posted July 11, 2017 Hi. My recently acquired '71 TR6 is running on Mabour General (never heard of them) 185x15 R tyres. Could anyone enlighten me to the correct tyre Pressures please? That is USA spec tyre size. One of our USA contingent will be along in a moment. Peter W Quote Link to post Share on other sites
peejay4A Posted July 11, 2017 Report Share Posted July 11, 2017 It might be a waste of time as the OP was back in 2015. FWIW I now run 28 front, 26 rear with a front ARB and Gaz shock absorbers set fairly hard. Roundabouts are quite a joy. Quote Link to post Share on other sites
OAF939M Posted July 12, 2017 Report Share Posted July 12, 2017 Thanks Pete, a friend who circuit races reckoned that was more like what I should be running, as 30 psi cold is quite a lot and last year the car was skittish. Quote Link to post Share on other sites
peejay4A Posted July 12, 2017 Report Share Posted July 12, 2017 If I were on the track, and I don't do that, I think I'd push my fronts to 30 and leave the rears as is. Quote Link to post Share on other sites
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