nutty7 Posted January 10, 2005 Share Posted January 10, 2005 I'm running 14" wheels on my supersport r and am thinking of buying some 13" i know about unsprung weight more choice less money, but if shod with the same tyres around a track would i notice much difference in the handling 🤔 Link to comment Share on other sites More sharing options...
Paul McKenzie Posted January 10, 2005 Share Posted January 10, 2005 Not if you could get the same tyres Seriously though, I'm sure there would be little difference between those two wheel sizes using exactly the same tyres, but the key to 13" is you have a much greater performance tyre choice Paul Link to comment Share on other sites More sharing options...
Myles Posted January 10, 2005 Share Posted January 10, 2005 ...and a dwindling 'cooking' tyre choice - see the recent 'RE720s no longer available' thread.... ☹️ Project Scope-Creep is underway... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
nutty7 Posted January 10, 2005 Author Share Posted January 10, 2005 Yes, been running on yoko 32's and believe these are also becoming extinct. Link to comment Share on other sites More sharing options...
Tight fart Posted January 10, 2005 Share Posted January 10, 2005 I have 32Rs SS on 14" rims, great for the road ( and fine on faster tracks) A7 RDP pics here Link to comment Share on other sites More sharing options...
Sandy Posted January 11, 2005 Share Posted January 11, 2005 Are they being discontinued then? I'm running 32's on 14" rims and am quite happy with them although they will need replacing soon. Guess I might have to consider alternatives? (Any recommendations - blatting and occassional track days?) Dont really want the expense of replacing the wheels? Took a fellow blatter out at last weeks meet he seemed surprised by the level of grip given by my tyres and in cold, damp conditions. A comment as such, coming from that miserable sod, Gareth 'Jack Dee' Harrold, just cant be ignored?! Its not the days in your life ..........But the LIFE in your days!! ;0)) Link to comment Share on other sites More sharing options...
Sheds Moderator Posted January 11, 2005 Share Posted January 11, 2005 I've driven 7s with 14" and they are very similar to mine on 13". Yoko 048s are available in 14, as are 021s so I wouldn't worry too much. Cost isn't sigificantly different AFAIK. Link to comment Share on other sites More sharing options...
4ster Posted January 11, 2005 Share Posted January 11, 2005 While you knowledgeable chaps are talking wheels & tyres, is it completely daft to have 185 60 14 on the front and 205 60 13 on the rear? Reasoning stems from many hours searcing through Tech Talk where it seems that most agree that wider at the rear is advantageous but doing it this way keeps the gearing much the same and Yoko AO48 (or 32 for the moment) are available in this size. Car is live axle with AO32R and a fairly sprightly Wilcox built Twincam (180bhp the dyno) and used mainly for trackdays. Any thoughts would be appreciated. Link to comment Share on other sites More sharing options...
custardtart Posted January 11, 2005 Share Posted January 11, 2005 13" wheels are noticeably better on the track if you can notice such things, The reason is partly due to less weight but also to do with gyroscopic effect. As for tyres, if it's for track work then the 32 while still around or the 48 will see you right. stop the war Link to comment Share on other sites More sharing options...
Tight fart Posted January 11, 2005 Share Posted January 11, 2005 is it completely daft to have 185 60 14 on the front and 205 60 13 on the rear? Yes A7 RDP pics here Edited by - Tight fart on 11 Jan 2005 17:48:04 Link to comment Share on other sites More sharing options...
4ster Posted January 11, 2005 Share Posted January 11, 2005 Thanks for your comments custardtart & tightfart, although an expansion on the "yes" would be interesting! It seems to be getting a bit arty farty around this corner of Blat Chat at the moment, is this significant? Link to comment Share on other sites More sharing options...
Tight fart Posted January 11, 2005 Share Posted January 11, 2005 Not being an expert I would say it would upset the car as the set up would change the attitude front to back. the ride height is very important when setting any car up and buy having taller wheels at the front you would put more weight to the rear. I think. A7 RDP pics here Link to comment Share on other sites More sharing options...
Luke Beaumont Posted January 11, 2005 Share Posted January 11, 2005 185/60R14 and 205/60R13 are near as dammit the same diameter, so it wouldn't upset the ride height rake if you previously had the same size tyre all round. If the 7 was limited on brake disc size you could take the opporunity to fit a bigger disc under the 14" front rim. Ultimately you can fit adequate brakes under 13" rims, and rotational mass is something you don't voluntarily add anywhere, especially the front where gyroscopic effect is in da house. Link to comment Share on other sites More sharing options...
Graham Perry Posted January 11, 2005 Share Posted January 11, 2005 Personally I would be tempted to try it and see. Link to comment Share on other sites More sharing options...
4ster Posted January 11, 2005 Share Posted January 11, 2005 Thanks tf, Luke & Graham, it sounds as though it is worth a try. This way I only have to fork out for two wheels & tyres so I think I will buy the 205 13 AO32s (while they are still around), get it corner weighted and see how it feels at Cadwell. Link to comment Share on other sites More sharing options...
Graham Perry Posted January 12, 2005 Share Posted January 12, 2005 Just take it easy to start with. My gut feeling is that you will get some understeer, but that is only my opinion Link to comment Share on other sites More sharing options...
4ster Posted January 12, 2005 Share Posted January 12, 2005 Just ordered "the last two" 205/60R13AO32S from Polley. All I need now are two 13 inch Minators (presumably 7 inch from what I have read on this forum) and I will give it a go. If it works, great. If not there could be some bargain wheels and tyres coming up in the spring! Link to comment Share on other sites More sharing options...
Alias Posted January 12, 2005 Share Posted January 12, 2005 I've gone for Yoko A048 185/60/14 on the fronts and 195/60/14 on the rear. This has worked pretty well, although I did have to change the front ARB to tweak the handling (at a cost of £30). The choice of tyre is limited on the 14'' wheel, but unless you want to put some ACB10s on, this shouldn't really affect you. Certainly the popular Yokos come in these sizes (i.e. A021 & A048). You might reduce unsprung weight with 13'' wheels, but if you are serious about this, you will want to run the big brake kit as this is lighter than the std kit (less use of cast iron for the callipers) ----------------------------------------------------------------- 1400 Supersport with 6 gears and clamshell wings Link to comment Share on other sites More sharing options...
Tight fart Posted January 12, 2005 Share Posted January 12, 2005 It's not that the overall diameter is that different, but the car should sit with a lower ride height front to rear. Stick 14" on the front and then drop the front ride height to the correct level and it will be fine. A7 RDP pics here Link to comment Share on other sites More sharing options...
Luke Beaumont Posted January 12, 2005 Share Posted January 12, 2005 I know that TF, but if you haven't changed the diameter of the tyres you won't have changed the rake of the chassis. Link to comment Share on other sites More sharing options...
Tight fart Posted January 12, 2005 Share Posted January 12, 2005 Agreed, but I'm not sure why you would be in this situation in the first place If you have 14" all round and want to lower the gearing it's going to upset the car if you only change rears. A7 RDP pics here Link to comment Share on other sites More sharing options...
Luke Beaumont Posted January 12, 2005 Share Posted January 12, 2005 I got the impression it was to get a rear tyre that was a) sticky and b) wider than 185. You can get some decent rubber for 14" rims but there's hardly anything, of any description, wider than 195. So instead of changing from 185/60R14 all round to 185/60R13 and 205/60R13, which are different sizes, you just change the rears to 205/60R13 which is about the same diameter as the 14" fronts, doesn't affect the rake and only needs two rims buying. Link to comment Share on other sites More sharing options...
4ster Posted January 12, 2005 Share Posted January 12, 2005 Good summary Luke. It also means that the gearing doesn't change & speedo (recently calibrated) is still almost accurate and, as you point out, is a more economical way of getting fatter rubber at the rear. Anyway, I have taken the plunge now and, if anyone is interested, will report experiences after first trackday. Link to comment Share on other sites More sharing options...
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