Lovexplosions Posted April 28, 2020 Report Share Posted April 28, 2020 If you have these wheels, what tire/suspension setup are you running. I have a 74' 620. Quote Link to comment
datzenmike Posted April 28, 2020 Report Share Posted April 28, 2020 5J rim width with 6.00x14 6 ply is the tire so 175/70R14 tire today. This what the 620 came with. The tire would be 23.5" tall and 5.8" wide but I doubt you have the original tires. You can go wider but I wouldn't go taller as this will hurt performance. What size tire do you have now?... need to know what you have in order to move forward. K5 Rally? is this the rim? If yes what is the offset and width as this will affect what will fit the truck for tire. If the K5s are sticking out too far and you go to a wider tire and then lower the truck it will come down on the tire tread. Do you have an original rim? So the question is what are your plans? Carry heavy loads, work truck, primarily highway or town driving, or lower to the ground and a bit wider tire for looks? comfort? handling? Quote Link to comment
Lovexplosions Posted April 28, 2020 Author Report Share Posted April 28, 2020 1 hour ago, datzenmike said: 5J rim width with 6.00x14 6 ply is the tire so 175/70R14 tire today. This what the 620 came with. The tire would be 23.5" tall and 5.8" wide but I doubt you have the original tires. You can go wider but I wouldn't go taller as this will hurt performance. What size tire do you have now?... need to know what you have in order to move forward. K5 Rally? is this the rim? If yes what is the offset and width as this will affect what will fit the truck for tire. If the K5s are sticking out too far and you go to a wider tire and then lower the truck it will come down on the tire tread. Do you have an original rim? So the question is what are your plans? Carry heavy loads, work truck, primarily highway or town driving, or lower to the ground and a bit wider tire for looks? comfort? handling? I am replacing all the tires, so they are irrelevant. I am not sure if these are the original rims, but I doubt it, and my google searches didn't help me.The tires are rotten and mismatched and the rims have some rust. The front are 195/70/14s and the back I can't even read because of tire rot. The tread is an off road tire though, rims are the same all around. There are some K5s (sorry that's not the rim, it's the rim off a K5 blazer) on C-list near me and I like how they look but I want to figure out what tire to get. I don't know the offset, but they are 15 X 8. (https://richmond.craigslist.org/wto/d/chesterfield-chevy-rally-wheels/7102551473.html). Eventually I want to get the truck lower (not slammed) as wide as possible with some fender flares and a couple fingers of clearance. Not a work truck, maybe carry my motorcycle (~470lbs) but if I can't achieve that with that clearance then no biggie. If I can get there I want a decent amount of negative offset (like 2inches) and some wide tires with less profile. Mostly around town and some highway time. If I could I would lower it first and then figure out the right diameter, but honestly with two flat tires and the tire rot where it is, I need to replace them first. I can't move the truck around to work on it in it's current state, and I have a more serious brake issue I need to tackle first. Quote Link to comment
datzenmike Posted April 29, 2020 Report Share Posted April 29, 2020 Always liked these. A 195/70R14 is 24.75" that's a 3 MPH speedometer difference at 50 MPH.... twice that at 100 MPH. You want 23 .6" tire diameter to keep your present acceleration and speedometer reading properly. Ask them to put a ruler across the rim outside face and measure down to the bolt holes. Compare that measurement to your rims. Will it fit inside the fender? I don't care for flairs as it destroys the original 620 look, but it's what ever you need to do. If K 5 rim then pick a width you like. Stock K5s are 8" wide rims so 8" at least. 205/55R15 are 8"wide 215/50R15 are 8.5" wide 240/45R15 are 9.5" wide These are all the same diameter as the stock 620 tire but much wider and in 15" rim. Quote Link to comment
Lovexplosions Posted April 29, 2020 Author Report Share Posted April 29, 2020 1 hour ago, datzenmike said: Always liked these. A 195/70R14 is 24.75" that's a 3 MPH speedometer difference at 50 MPH.... twice that at 100 MPH. You want 23 .6" tire diameter to keep your present acceleration and speedometer reading properly. Ask them to put a ruler across the rim outside face and measure down to the bolt holes. Compare that measurement to your rims. Will it fit inside the fender? I don't care for flairs as it destroys the original 620 look, but it's what ever you need to do. If K 5 rim then pick a width you like. Stock K5s are 8" wide rims so 8" at least. 205/55R15 are 8"wide 215/50R15 are 8.5" wide 240/45R15 are 9.5" wide These are all the same diameter as the stock 620 tire but much wider and in 15" rim. Thanks! Quote Link to comment
Lovexplosions Posted April 29, 2020 Author Report Share Posted April 29, 2020 31 minutes ago, d.p said: 195/50/15 Looks good, my truck is the same color with white wheels. Quote Link to comment
datzenmike Posted April 29, 2020 Report Share Posted April 29, 2020 1 hour ago, d.p said: 195/50/15 7.7" wide and an inch shorter than stock. 22.65". Do they clear the fenders on bumps? Quote Link to comment
d.p Posted May 1, 2020 Report Share Posted May 1, 2020 On 4/28/2020 at 10:55 PM, datzenmike said: 7.7" wide and an inch shorter than stock. 22.65". Do they clear the fenders on bumps? yes. Quote Link to comment
six2ohyea Posted May 15, 2023 Report Share Posted May 15, 2023 On 4/28/2020 at 5:45 PM, datzenmike said: Always liked these. A 195/70R14 is 24.75" that's a 3 MPH speedometer difference at 50 MPH.... twice that at 100 MPH. You want 23 .6" tire diameter to keep your present acceleration and speedometer reading properly. Ask them to put a ruler across the rim outside face and measure down to the bolt holes. Compare that measurement to your rims. Will it fit inside the fender? I don't care for flairs as it destroys the original 620 look, but it's what ever you need to do. If K 5 rim then pick a width you like. Stock K5s are 8" wide rims so 8" at least. 205/55R15 are 8"wide 215/50R15 are 8.5" wide 240/45R15 are 9.5" wide These are all the same diameter as the stock 620 tire but much wider and in 15" rim. I’m looking into the K5 rally rim also. 15x8, So you recommend 205/55R15 to keep performance? Quote Link to comment
datzenmike Posted May 15, 2023 Report Share Posted May 15, 2023 Measure the diameter of your present tires or post the tire/rim size. Quote Link to comment
six2ohyea Posted May 15, 2023 Report Share Posted May 15, 2023 Bought the truck with these on. 185/55R15 Quote Link to comment
datzenmike Posted May 15, 2023 Report Share Posted May 15, 2023 You have 2wd or 4x4????? 185/55R15s are 23" diameter. That's a lot smaller than the stock 25.5" 2wd or the 27.7" 4x4 tires. Quote Link to comment
six2ohyea Posted May 15, 2023 Report Share Posted May 15, 2023 (edited) 1 hour ago, datzenmike said: You have 2wd or 4x4????? 185/55R15s are 23" diameter. That's a lot smaller than the stock 25.5" 2wd or the 27.7" 4x4 tires. 2wd, yeah the current wheels look ugly IMO. Edited May 15, 2023 by six2ohyea Quote Link to comment
Tucson620 Posted May 16, 2023 Report Share Posted May 16, 2023 215/60 R15 - lowered 3". Work for me w/light rub at full lock. My fenders are rolled though. Equivalent to 25.5" x 8.5" 1 Quote Link to comment
six2ohyea Posted May 16, 2023 Report Share Posted May 16, 2023 Nice! Those might be a bit to big for me. What are you rubbing on? Quote Link to comment
six2ohyea Posted May 16, 2023 Report Share Posted May 16, 2023 1 hour ago, Tucson620 said: 215/60 R15 - lowered 3". Work for me w/light rub at full lock. My fenders are rolled though. Equivalent to 25.5" x 8.5" BTW do you know the offset/back spacing? Quote Link to comment
Stoffregen Motorsports Posted May 16, 2023 Report Share Posted May 16, 2023 A 205/60-15 might do the trick. A real Blazer rally wheel is 15x8 and has 4" of backspacing, so zero offset, unless the backspacing measurement includes the wheel lip, then it's more like 1/2" negative offset. 1 Quote Link to comment
Stoffregen Motorsports Posted May 16, 2023 Report Share Posted May 16, 2023 Found a better answer. 1 Quote Link to comment
Tucson620 Posted May 16, 2023 Report Share Posted May 16, 2023 13 hours ago, six2ohyea said: Nice! Those might be a bit to big for me. What are you rubbing on? Rub is at front inner fender at full lock - think one side. Had to tune height and fenders aren't straight. Here's some other Chevy Rally threads with pics - good information. 195/50R15 on lowered truck seemed popular. https://ratsun.net/topic/54224-chevy-rallys-on-521-any-issues/ https://ratsun.net/topic/71107-chevy-rallye-tire-sizebrand/ 1 Quote Link to comment
Stoffregen Motorsports Posted May 16, 2023 Report Share Posted May 16, 2023 195/50-15 is tiny by comparison. Quote Link to comment
Tucson620 Posted May 16, 2023 Report Share Posted May 16, 2023 (edited) Was saying the 195/50 R15 seemed popular in the Chevy Rallye threads for lowered trucks - function, appearance, rubs, etc. Comparison to stock size. More burly looks good to me - but tradeoffs. I tried 225/50R15 but they rubbed horribly. Edited May 16, 2023 by Tucson620 1 Quote Link to comment
six2ohyea Posted May 16, 2023 Report Share Posted May 16, 2023 I do have the truck dropped 3” Quote Link to comment
six2ohyea Posted May 16, 2023 Report Share Posted May 16, 2023 Maybe 200/60R15? 1 Quote Link to comment
Stoffregen Motorsports Posted May 16, 2023 Report Share Posted May 16, 2023 205/60-15 There is no such thing as a 200/60-15 Quote Link to comment
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