thezguy Posted March 11, 2015 Share Posted March 11, 2015 I went ahead and said screw it.. I ordered some Weld RTS 15X9 5.5BS and some 275/60/15 MT ET street PRO X275 tires. I hope the 28" tire doesn't rub my shock towers.. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted March 11, 2015 Share Posted March 11, 2015 It will probably rub without a spacer adapter. With no spacer you need a 4.5 back spacing to clear the strut, even with coilovers cause that tire sidewall bulges over the edge of the rim a good bit. I just mounted 275/60/15 Radial Pro as my landspeed drive tire (God, those are pretty tires). I am on 15x8s but backspacing is backspacing so the width shouldn't really matter since you have flares. Can you put a carpenters square on the center of your stub axle and measure the outside diameter of your calipers? Isnt there a speed shop in Houston where you can get cheap used stuff to do your trial and error fitting instead of buying and maybe returning new stuff? I can send you a Weld Draglite 15x7 4.5BS to try over your calipers if you promise to send it back. All my 15x8s are mounted and balanced with tubes and bead screws. Quote Link to comment Share on other sites More sharing options...
thezguy Posted March 11, 2015 Share Posted March 11, 2015 (edited) I tried like hell for the 4.5" BS but it's a tough size to find. I got ID sizes of the new wheels vs. what I got and i think I'll clear them by 1/8" or so. I'm more worried about the tire height than anything. Although the 9" wheel might stop it from bulging a lot. If the 28's don't fit I can always use a 26" tire. I'm not familiar with the shop you are talking about though. Edited March 11, 2015 by thezguy Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted March 11, 2015 Share Posted March 11, 2015 What's the bolt pattern on that wheel? Quote Link to comment Share on other sites More sharing options...
Zfan1 Posted March 11, 2015 Share Posted March 11, 2015 I just ordered a set of 275/50-15 Mickey Thompson drag radials for the rear, time to ditch the 255/60's. I am going to Ennis (Texas Motorplex) Friday night to get some motor passes before another cam swap. Hope for low low 10's on motor then swap cam and maybe get a high 9 second pass on motor. Quote Link to comment Share on other sites More sharing options...
thezguy Posted March 11, 2015 Share Posted March 11, 2015 What's the bolt pattern on that wheel? 4x114.3 Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted March 11, 2015 Share Posted March 11, 2015 Let us know how the increased diameter of that tire affects things. I went from 26" to 28" and it kinda killed the car. Dropped my rpm going thru the timers from 6200 to like 5300 and wanted to basically stop the engine on clutch dump. But, I'm low hp so I think that sort of thing effects me more than it will you. Next tire for me to try is a 27x11.5 MT ET Street bias ply. The section width is 11.5 but I understand the tread is 9". I gotta wear out what I got first. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted March 11, 2015 Share Posted March 11, 2015 (edited) Ok zguy, if it rubs, you just gotta get some 1" to 1.5" (depending on your existing stud length) 4x114.3 to 4x114.3 spacer adapters from Internet. I think mine were $44 for the pair. Torque them to 90# with a torque wrench. Inspect them regularly for cracks around the studs and wallowing of the studs in the aluminum and you should be good. The Radial Pro only comes in the 275/60/15 (28"). Allowable height will depend on how much metal you removed when flaring and/or ride height. For me the area of conflict was at the dogleg. For a 26" tire you need 235/60/15 ET Street like Infidel runs. I think the 255/50/15 is the same diameter-wider with short sidewall. Edited March 11, 2015 by RebekahsZ Quote Link to comment Share on other sites More sharing options...
78 LS2 Z Posted March 11, 2015 Share Posted March 11, 2015 What are those speed rated to? I believe these are S speed rated. If I recall correctly, these are the radial version of the Volkswagon Bug tires (hey this is HybridZ after all...), so maybe they are rated to 80 mph! Not sure about the aspect ratio either (my brand of tires never state this, I guess this is why they simply refer to these as "165 metric radials") but I would imagine these are about 165/85 or so. I run these on the street and track with no issues and 120 mph traps through the 1/8th. They do well on big wheelstands too (I couldn't really tell a difference between the cheaters in this regard). There is however a considerable difference in street manners in my experiences from the barely street legal skinnies, which to me made me feel disconnected from the car, especially when running cheater slicks out back on sunny days.. If you regularly drive your car on the street and are ever caught in the rain you will be glad you had these front tires. Good tread that sheds water well, I really don't care about the additional rolling resistance.... You will have to decide whether exceeding the speed rating is an issue for you... I would be interested in other's opinions about exceeding the speed rating, say through the 1/4 mile- I have other friends running the same tire, no issues and these are very quick street/track cars with different power adders and setups, several of these cars do still run the quarter with these tires. I don't run the quarter anymore anyway since I've been banned in Ennis for no license so I'm really not worried about a few MPH over in the 1/8th. There is a safety factor built in with the advertised speed ratings anyway. I looked for the highest quality tire I could find and these were still very cheaply priced tires in comparison to the drag tires and are cheap enough that I replace them yearly regardless of the mileage for added safety (for whatever that is worth). Quote Link to comment Share on other sites More sharing options...
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