stpauls Posted March 11, 2017 Report Share Posted March 11, 2017 Do IRC rear tyres still come off the modern Motad-style rims when inflated at very low pressures, 2 - 3 psi? If so, then why don't the manufacturers make the bead a bit smaller/reduce it's circumference? Quote Link to comment Share on other sites More sharing options...
collyolly Posted March 11, 2017 Report Share Posted March 11, 2017 Why run the pressure so low ? IRC tires have very soft side walls, although I suppose if it's going to come off a pound or two won't make any difference. Quote Link to comment Share on other sites More sharing options...
lineaway Posted March 11, 2017 Report Share Posted March 11, 2017 It`s supposed to be the rim that is slightly off on tolerance. 1 Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted March 12, 2017 Report Share Posted March 12, 2017 They're both supposed to be made to a standard, to ensure compatability. Such a quality control issue ahould not have existed for as long as it has. 2 Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted March 12, 2017 Report Share Posted March 12, 2017 Inmotiontrials now stock something they call "The New IRC Tubeless Tyre". https://www.inmotiontrials.com/new-irc-tubeless-tyre-now-stock/. Design changed? Quote Link to comment Share on other sites More sharing options...
stpauls Posted March 15, 2017 Author Report Share Posted March 15, 2017 IRC tyres changed their design? Quote Link to comment Share on other sites More sharing options...
lineaway Posted March 15, 2017 Report Share Posted March 15, 2017 not just IRC.https://www.youtube.com/watch?v=sT_1XvMHw8U&feature=youtu.be 3 Quote Link to comment Share on other sites More sharing options...
stpauls Posted April 6, 2017 Author Report Share Posted April 6, 2017 Just saw this. Cambridge Trials, so I would not expect them to make unsubstantiated claims. http://www.ebay.co.uk/itm/IRC-4-00-X-18-TR11-TUBELESS-TYPE-REAR-TRIALS-TYRE-BRAND-NEW-DESIGN-/232265111304?hash=item3614145708:g:RC4AAMXQlgtRuCil Anyone tried the new ones yet? Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted April 6, 2017 Report Share Posted April 6, 2017 "These tyres are the brand new 2017 model with the re-designed bead to fit modern rims better. " Quote Link to comment Share on other sites More sharing options...
biffsgasgas Posted April 6, 2017 Report Share Posted April 6, 2017 Yes the revised irc still come off the rim. Multiple rims. We are calling them "i r ceeing you dnf any moment". At 5 to 6 psi the leak slowly and around 3 ish become a bracelet. My dunlop d803gp's have ridden half a loop in sections flat (only on the bottom mind you) just to make their way back to the pits for a repair. I have found the sidewall on the irc to be stiffer not softer. --Biff 2 Quote Link to comment Share on other sites More sharing options...
digger144 Posted April 14, 2017 Report Share Posted April 14, 2017 having problems with the dunlop 803gp anythink below 6psi and it goes flat.absolute rubbish tyre Quote Link to comment Share on other sites More sharing options...
jonnyc21 Posted April 14, 2017 Report Share Posted April 14, 2017 I remember hearing that some of the wheels have a bit of issues with some tires... So, what kind of wheel do you have? Quote Link to comment Share on other sites More sharing options...
timp Posted April 15, 2017 Report Share Posted April 15, 2017 I'm have tried a new type IRC that isn't supposed to deflate. Starting pressure on lap 1. 4 psi Finishing pressure. 3.5 psi Starting pressure on lap 2. 4 psi Finishing pressure. 2.5 psi. This was a rocky two lap road trial. Probably better result than older IRC but still far from acceptable. I have now given the bead two coats of Tip Top bead sealer to see if it will help. Lomax road trial on Monday will test it! Quote Link to comment Share on other sites More sharing options...
timp Posted April 15, 2017 Report Share Posted April 15, 2017 On 06/04/2017 at 11:02 PM, biffsgasgas said: Yes the revised irc still come off the rim. Multiple rims. We are calling them "i r ceeing you dnf any moment". At 5 to 6 psi the leak slowly and around 3 ish become a bracelet. My dunlop d803gp's have ridden half a loop in sections flat (only on the bottom mind you) just to make their way back to the pits for a repair. I have found the sidewall on the irc to be stiffer not softer. --Biff You are right. They have a stiffer sidewall and softer tread area. Quote Link to comment Share on other sites More sharing options...
b40rt Posted April 15, 2017 Report Share Posted April 15, 2017 3 minutes ago, timp said: You are right. They have a stiffer sidewall and softer tread area. Does this apply to the tube type to ? Quote Link to comment Share on other sites More sharing options...
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