frankyknuckles Posted March 14, 2005 Share Posted March 14, 2005 13" CR500's 16psi front and 18psi rear. Owner Manual says 20psi all round for these tyres on an R500. Are these cold or hot temps? www.R300.net Link to comment Share on other sites More sharing options...
Myles Posted March 14, 2005 Share Posted March 14, 2005 'Always' measure cold. Project Scope-Creep is underway... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
simonbell Posted March 14, 2005 Share Posted March 14, 2005 Franky.....the pressures you have quoted are what I`m using on my Yoko 48R`s Simon Bell - Caterham 7 Duratec R I`ve seen the future.....and it`s powered by duratec Check out the website here Link to comment Share on other sites More sharing options...
Stuart Faulds Posted March 14, 2005 Share Posted March 14, 2005 'Always' measure cold. Link to comment Share on other sites More sharing options...
MartinWoodham Posted March 14, 2005 Share Posted March 14, 2005 I've been told 18s all round then tweak from there to your taste (Caterham Midlands). That's for the new-spce CR500s, but I think the old ones were the same pressure-wise... Martin 2004 ex-Academy car going on Roadsports B... If everything's under control you're going too slow (Emmerson Fittipaldi) Link to comment Share on other sites More sharing options...
A10ROX Posted March 14, 2005 Share Posted March 14, 2005 Tyres work best at optimum temperature All wheels do different work Therefore, I was told and it seems to work, add one psi more for the back compared to the front and one more nearside to offside (clockwise tracks like Donington) Try different pressures and experience the difference It's not primrose it's Dakkar Yellow Link to comment Share on other sites More sharing options...
ponant Posted March 14, 2005 Share Posted March 14, 2005 l have cr500 on 15" psi down to 14" front 15" rear Link to comment Share on other sites More sharing options...
Sue Dinnim Posted March 14, 2005 Share Posted March 14, 2005 I run 18psi all round on my CR500's on 13" wheels. Link to comment Share on other sites More sharing options...
Asklepios Posted March 14, 2005 Share Posted March 14, 2005 A10, I suppose "tyre will work best at optimum temperature" , otherwise wouldn`t be optimum. Your point on differential tye pressures cold is interesting. I suppose you could prove your theory by testing the pressures hot, after a race and see that they were the same across an axle. Your interesting post was coy about actual numbers however! Link to comment Share on other sites More sharing options...
noddy Posted March 14, 2005 Share Posted March 14, 2005 I run 18 front / 20 rears for the road Found at brands Indy car was best (cold) n/s front 16, o/s front 17, n/s rear 18, o/s rear 19. when measured hot front were even @ 21 and rears were even @ 23 R400 .......... I love it Link to comment Share on other sites More sharing options...
david nelson Posted March 14, 2005 Share Posted March 14, 2005 I run my cr500 at 23 allround when hot David Link to comment Share on other sites More sharing options...
Mark Piper Posted March 14, 2005 Share Posted March 14, 2005 I run mine at 18 psi all round Link to comment Share on other sites More sharing options...
Petrolhead Posted March 15, 2005 Share Posted March 15, 2005 I was running 18psi cold all round but the middle of the backs have worn out well before the edges. Just checked the fronts 12.5 psi so maybe the earlier poster knows somit - l have cr500 on 15" psi down to 14" front 15" rear I am going to run the backs at 16, same as the fronts R5 no 65 😬 I am after a pair of half doors Edited by - Petrolhead on 15 Mar 2005 00:46:56 Link to comment Share on other sites More sharing options...
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