Vimeous Posted March 4, 2012 Report Share Posted March 4, 2012 ... how is it done and by whom? I want Goodyear F1's and can't get them without altering the rolling radius of the wheels, either by reducing the tyre profile or upping the wheel size. However I'm also keen to get from A-to-B quickly without getting stung by the infestation of average speed cameras currently plaguing our highways. What do you do to avoid this issue? Link to comment Share on other sites More sharing options...
Bill T Posted March 4, 2012 Report Share Posted March 4, 2012 I use a sat nav. In any event I've never seen a speedo under read. Link to comment Share on other sites More sharing options...
pickles Posted March 4, 2012 Report Share Posted March 4, 2012 Ive just fitted these to 17" GT Rims, good choice What size rims u got 16"? Link to comment Share on other sites More sharing options...
Vimeous Posted March 4, 2012 Author Report Share Posted March 4, 2012 (edited) Running standard 15's. I'm not keen to trust a SatNav if only because I've seen some being 10mph over optimistic at 60mph. Oh and I refuse to buy one Standard Gen6 is 205/55/15 but the tallest F1's on 15's are 195/45/15 or 64.2 @ 70 - useless. My plan was to swap to GT4 wheels but at 7.5" wide it means the 215/40/16 or 66.8 @ 70 - also not ideal. 17's mean 205/55 or 225/45 (with 7.5"+ wheels) both which are likely to get very pricey! True going slower is technically better but also much less efficient in getting me where I want to go. Oh and reducing the overall diameter on a car with huge arches wasn't part of the plan. So either I change the wheel plans and stick to 16x7's (205/50/16 for 70.7 @ 70 - ok) or recalibrate the speedo Edited March 4, 2012 by Vimeous Link to comment Share on other sites More sharing options...
Bill T Posted March 4, 2012 Report Share Posted March 4, 2012 Well for speed average camera's they are a lot better than any speedo. Mine is always spot on when I go through one of those things that tell you you're speed when you are over the limit You have to remember they fitted speedo's to Lada's, Tomahawk cruise missiles get GPS. These days probably cheaper than a recab plus a host of other benefits. Link to comment Share on other sites More sharing options...
carlasumm Posted March 4, 2012 Report Share Posted March 4, 2012 i done mine via satnav and even at 70 there is like only 2mph difference between my speedo and the satnav and judging by the other traffic it cant be far out at all Link to comment Share on other sites More sharing options...
Vimeous Posted March 4, 2012 Author Report Share Posted March 4, 2012 True. But I'm old and obstinate and really don't want a SatNav - it's damn lazy for starters. I recently tried one when hunting for car garages around the country and was forced to make more u-turns that I've done in the last 10 years! Besides I can't help but see it as an admission of defeat! :rolleyes: Link to comment Share on other sites More sharing options...
Bill T Posted March 4, 2012 Report Share Posted March 4, 2012 Smash the spinning Jenny!!! Link to comment Share on other sites More sharing options...
Adex Posted March 4, 2012 Report Share Posted March 4, 2012 (edited) Theres no need to recalibrate for smaller profile tyres at all. 99.99% of all speedo's over-read to begin with. As such, fitting a lower profile will make your speedo over-read even more.. Even if it you fitted much smaller wheels & tyres, enough to make your speedo way out, it would still be over-reading so you won't get caught by a average speed camera anyway as you'll always be going slower than you think at any given point. In the same way, if you fit bigger wheels, you make your speedo slightly more accurate. Up to a point anyway, (not going from 16's to 20's for example). Even then though, you'll probably still only be a couple of mph out, even at 70/80mph + Most a/s camera limits are 40/50mph anyway so we're talking fractions of a mph here! Edited March 4, 2012 by Adex Link to comment Share on other sites More sharing options...
Bill T Posted March 4, 2012 Report Share Posted March 4, 2012 This^^^ Link to comment Share on other sites More sharing options...
Adex Posted March 4, 2012 Report Share Posted March 4, 2012 Just dug this out if anyone wants a second opinion. (Sorry bill, third opinion!) Link to comment Share on other sites More sharing options...
Vimeous Posted March 4, 2012 Author Report Share Posted March 4, 2012 Aww ok then .... just as long I don't substitute Hilux undercarriage and 22" rims I'll be fine then Link to comment Share on other sites More sharing options...
Bill T Posted March 4, 2012 Report Share Posted March 4, 2012 If you want to be safe come to my house very sloiwy and we can go out with my satnav to make sure Link to comment Share on other sites More sharing options...
sh3p Posted March 4, 2012 Report Share Posted March 4, 2012 (edited) or if you have a smartphone there are lots of apps to give you a gps speedo without buying a satnav ... Edited March 4, 2012 by sh3p Link to comment Share on other sites More sharing options...
LiamGTR Posted March 4, 2012 Report Share Posted March 4, 2012 or if you have a smartphone there are lots of apps to give you a gps speedo without buying a satnav ... He admitted he was "old", and also if he refuses to buy a Sat Nav I doubt he'll have a smart phone Lol sorry dude Link to comment Share on other sites More sharing options...
Bill T Posted March 4, 2012 Report Share Posted March 4, 2012 I've got both and in club terms I'm a fossil Link to comment Share on other sites More sharing options...
LiamGTR Posted March 4, 2012 Report Share Posted March 4, 2012 I've got both and in club terms I'm a fossil Link to comment Share on other sites More sharing options...
GreyRacer Posted March 4, 2012 Report Share Posted March 4, 2012 I'm old and I use both. and the smart phone so that make three. Good choice on the F1 s. Link to comment Share on other sites More sharing options...
Vimeous Posted March 4, 2012 Author Report Share Posted March 4, 2012 (edited) He admitted he was "old", and also if he refuses to buy a Sat Nav I doubt he'll have a smart phone Lol sorry dude Ok not that old but you're right about the phone as I've had to dig out my 6230i after the N95 died. I'll catchup in May when the Lumia 900 appears If I get desparate my dearest whips out the iPad and all is well. That is until googlemaps lack of clarity turns us both potty! I ran F1's for years on my Civic after trying out many alternatives. I like the combination of grip in all conditions, predictable breakaway and comfort. Hopefully the Celica will minimise the slightly soft sidewalls and give me the confidence all the 205/55/15's I've tried don't. Edited March 4, 2012 by Vimeous Link to comment Share on other sites More sharing options...
ams Posted March 5, 2012 Report Share Posted March 5, 2012 195/45/15 are way too small for the g6 - they will be lost under there and the gearing will be pretty poor too Id imagine Link to comment Share on other sites More sharing options...
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