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May 14, 2007 13:43:31 GMT
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Hi, I am hopefully going to get round to refurbing the Cosmic alloys I bought before xmas in time for the summer shows, got some brand new centre caps  Just got to polish and paint them. I could do with some tyre advice though, the Cosmics are 5.5J and 13 inchers. The wheels on the Viva at the moment are 13" weller steels either 5.5 or 6J I think and the tyre size on them is 185/70. So do I stick with 185/70 R13 tyres which look ok on the wellers but look quite tall or do I go with some lower profiles and have some of this stretch thingy?  Where would the cheapest place to get some be as well, not many places seem to stock 13 inch tyres nowadays  Ps Original factory tyre size was 155/80R13  |
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bstardchild
Club Retro Rides Member
Posts: 14,965
Club RR Member Number: 71
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May 14, 2007 13:54:51 GMT
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Hi, I am hopefully going to get round to refurbing the Cosmic alloys I bought before xmas in time for the summer shows, got some brand new centre caps Just got to polish and paint them. I could do with some tyre advice though, the Cosmics are 5.5J and 13 inchers. The wheels on the Viva at the moment are 13" weller steels either 5.5 or 6J I think and the tyre size on them is 185/70. So do I stick with 185/70 R13 tyres which look ok on the wellers but look quite tall or do I go with some lower profiles and have some of this stretch thingy? Where would the cheapest place to get some be as well, not many places seem to stock 13 inch tyres nowadays Ps Original factory tyre size was 155/80R13 Don't think you are going to get some of this stretch thing on 5.5J rims and keep the speedo anything like close to accurate Not sure that you current tyres are that close now!! |
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May 14, 2007 14:02:10 GMT
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I see, the difference between factory tyre size and current tyre size is -11% so at 70mph indicated I would actually be doing 68.69 which is ok as I don't mind it under reading.
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Last Edit: May 14, 2007 14:02:29 GMT by Deleted
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,542
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May 14, 2007 14:41:01 GMT
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Here's some 175/70's on some 5.5" Cosmics for you   175/70 is pretty much identical rolling radius as 155/80. While not Cosmics, these are also 5.5". The rears are 175/70 and fronts 165/70.  Those sizes should be available easily from anywhere  We just paid £120 ish for the new decent quality set in the last photo. I wouldn't be too concened about teh accuracy of your speedo. It'll alter a little if you have a different size tyre but then who said it was right in the first place? Just make a note of what speed everyone else goes past the speed cameres with out getting flashed  |
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Follow your dreams or you might as well be a vegetable. |
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May 14, 2007 15:17:01 GMT
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Cheers Seth, those 175/70's look fine so I will get a set of those  I think I said they were hard to find as I was checking a website that didn't seem to have any 13" tyres on, but yeah they should be readily obtainable |
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bstardchild
Club Retro Rides Member
Posts: 14,965
Club RR Member Number: 71
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May 14, 2007 15:30:12 GMT
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I see, the difference between factory tyre size and current tyre size is -11% so at 70mph indicated I would actually be doing 68.69 which is ok as I don't mind it under reading. 11% under at 70 mph is 62mph I agree under is better (safer) But don't forget your odeometer will read 100 miles covered for every 89 miles so correct for that if you work your mpg out and find it's better than expected |
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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May 14, 2007 15:37:53 GMT
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Surely its better to read faster then your attualy going? Oh yeh you want 165/60s too |
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May 14, 2007 17:04:51 GMT
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I see, the difference between factory tyre size and current tyre size is -11% so at 70mph indicated I would actually be doing 68.69 which is ok as I don't mind it under reading. 11% under at 70 mph is 62mph I agree under is better (safer) But don't forget your odeometer will read 100 miles covered for every 89 miles so correct for that if you work your mpg out and find it's better than expected Yeah I put 11% instead of 11mm difference  It's actually -1.87% Surely its better to read faster then your attualy going? Oh yeh you want 165/60s too Under reading means that the speedo will be reading faster than I am actually going, Ie the speedo reads 70 but I am doing 65 is better than the speedo reading 70 but the car actually doing 75 as I don't want to get a ticket I think we are both making the same point though I always get confused here actually, is that under reading or over reading  Lol 165/60s would be 8.65% smaller than stock tyres so would undergear it quite a bit, would help acceleration though I guess |
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Last Edit: May 14, 2007 17:08:41 GMT by Deleted
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Odin
Posted a lot
Posts: 1,406
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May 14, 2007 18:40:53 GMT
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145/60s and slam FTW!  Only 15% out, it's all good. |
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IMO 185/60s were made for these rims 175/70s should do the trick. |
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1941 Wolseley Not Rod - 1956 Humber Hawk - 1957 Daimler Conquest - 1966 Buick LeSabre - 1968 Plymouth Sport Fury - 1968 Ford Galaxie - 1969 Ford Country Squire - 1969 Mercury Marquis - 1970 Morris Minor - 1970 Buick Skylark - 1970 Ford Galaxie - 1971 Ford Galaxie - 1976 Continental Mark IV - 1976 Ford Capri - 1994 Ford Fiesta
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Mr K
Posted a lot
Posts: 2,993
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May 15, 2007 12:33:00 GMT
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11% under at 70 mph is 62mph I agree under is better (safer) But don't forget your odeometer will read 100 miles covered for every 89 miles so correct for that if you work your mpg out and find it's better than expected Yeah I put 11% instead of 11mm difference It's actually -1.87% Surely its better to read faster then your attualy going? Oh yeh you want 165/60s too Under reading means that the speedo will be reading faster than I am actually going, Ie the speedo reads 70 but I am doing 65 is better than the speedo reading 70 but the car actually doing 75 as I don't want to get a ticket I think we are both making the same point though I always get confused here actually, is that under reading or over reading Lol Under reading = car doing 70, the speedo is under reading....... and saying 68, so you do a 'indicated' 70mph, and your now speeding.... over reading is the way to go! (i.e. speedo says your going faster than you realy are) |
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Just got to polish and paint them.
We just paid £120 ish for the new decent quality set in the last photo. I wouldn't be too concened about teh accuracy of your speedo. It'll alter a little if you have a different size tyre but then who said it was right in the first place? Just make a note of what speed everyone else goes past the speed cameres with out getting flashed 
I think I said they were hard to find as I was checking a website that didn't seem to have any 13" tyres on, but yeah they should be readily obtainable 
It's actually -1.87% 
Lol
