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Re: Too Much Negative Offset?
Posted: Sun Apr 23, 2023 3:45 pm
by Alvin
Rutty wrote: ↑Sun Apr 23, 2023 12:56 pm
So I picked them up yesterday. The price wasn't bad so I took a chance. The good news is they're 14x5.5 and not 6.5. The bad news is the backspace is not 3.5 but 3. So that puts them at an offset of -6.4mm. With the 185 tires on them they are just hitting the rear fender. If I would get 175 tires and roll the fenders they might work. I like them but am not sure if they're worth the effort.
Matt,
That is great news on the sizing. The tire you have pictured is a 185 (SR) 14, which is equivalent to an 80-series sidewall...which is HUGE.
A 185/70/14 tire would be perfect, and solve your rear fender clearance. A 175 would also work.
Re: Too Much Negative Offset?
Posted: Sun Apr 23, 2023 8:37 pm
by redroadster
JC Whitney last time I looked still had the helper springs , they are for a 620 pu but fit the 311 , they re arch the springs too a bit , not hard to install ,
Re: Too Much Negative Offset?
Posted: Mon Apr 24, 2023 9:09 am
by Rutty
Alvin wrote: ↑Sun Apr 23, 2023 3:45 pm
Rutty wrote: ↑Sun Apr 23, 2023 12:56 pm
So I picked them up yesterday. The price wasn't bad so I took a chance. The good news is they're 14x5.5 and not 6.5. The bad news is the backspace is not 3.5 but 3. So that puts them at an offset of -6.4mm. With the 185 tires on them they are just hitting the rear fender. If I would get 175 tires and roll the fenders they might work. I like them but am not sure if they're worth the effort.
Matt,
That is great news on the sizing. The tire you have pictured is a 185 (SR) 14, which is equivalent to an 80-series sidewall...which is HUGE.
A 185/70/14 tire would be perfect, and solve your rear fender clearance. A 175 would also work.
So you think that they'd clear the fenders with a smaller diameter tire? The ones on the rims now are really big. Probably 2" bigger in diameter than the 185/65R14 tires I have on the stock rims now.
Re: Too Much Negative Offset?
Posted: Mon Apr 24, 2023 9:24 am
by Rutty
redroadster wrote: ↑Sun Apr 23, 2023 8:37 pm
JC Whitney last time I looked still had the helper springs , they are for a 620 pu but fit the 311 , they re arch the springs too a bit , not hard to install ,
Are these the type of springs you're talking about redroadster? I didn't know these existed.
Re: Too Much Negative Offset?
Posted: Mon Apr 24, 2023 9:44 am
by rwmann
205/60R14 tires easily fit within the rear fender and wheel tub on a 7" wide rim with -15mm offset.
Re: Too Much Negative Offset?
Posted: Mon Apr 24, 2023 10:38 am
by redroadster
Rutty wrote: ↑Mon Apr 24, 2023 9:24 am
redroadster wrote: ↑Sun Apr 23, 2023 8:37 pm
JC Whitney last time I looked still had the helper springs , they are for a 620 pu but fit the 311 , they re arch the springs too a bit , not hard to install ,
Are these the type of springs you're talking about redroadster? I didn't know these existed.
I don't see them anymore on JC Whitney's
But if you search datsun 620 helper springs or add a leaf , there quite a bit , my kit gave 2 or 3 as adda leafs ,I used only the short ones
Re: Too Much Negative Offset?
Posted: Mon Apr 24, 2023 10:40 am
by Alvin
Rutty wrote: ↑Mon Apr 24, 2023 9:09 am
Alvin wrote: ↑Sun Apr 23, 2023 3:45 pm
Rutty wrote: ↑Sun Apr 23, 2023 12:56 pm
So I picked them up yesterday. The price wasn't bad so I took a chance. The good news is they're 14x5.5 and not 6.5. The bad news is the backspace is not 3.5 but 3. So that puts them at an offset of -6.4mm. With the 185 tires on them they are just hitting the rear fender. If I would get 175 tires and roll the fenders they might work. I like them but am not sure if they're worth the effort.
Matt,
That is great news on the sizing. The tire you have pictured is a 185 (SR) 14, which is equivalent to an 80-series sidewall...which is HUGE.
A 185/70/14 tire would be perfect, and solve your rear fender clearance. A 175 would also work.
So you think that they'd clear the fenders with a smaller diameter tire? The ones on the rims now are really big. Probably 2" bigger in diameter than the 185/65R14 tires I have on the stock rims now.
Yes, I think your tires are way too wide and tall of a sidewall. I just entered in sizes to calculate overall diameter in Google and the difference is a 1.5"
185/SR/14 25.7"
185/70/14 is 24.2"
https://www.calculator.net/tire-size-calculator.html
Re: Too Much Negative Offset?
Posted: Fri Apr 28, 2023 2:04 pm
by Rutty
I had an old 175/70R14 mounted to one of the rims. The clearance is much better. I have 1/2" clearance now. If I'm calculating correctly I'd have 5mm less clearance if I went to a 185/65R14.
Re: Too Much Negative Offset?
Posted: Fri Apr 28, 2023 3:05 pm
by Alvin
Rutty wrote: ↑Fri Apr 28, 2023 2:04 pm
I had an old 175/70R14 mounted to one of the rims. The clearance is much better. I have 1/2" clearance now. If I'm calculating correctly I'd have 5mm less clearance if I went to a 185/65R14.
Nice work!
I'm surprised how beefy the sidewall is even with 175/70/14!
The 185/65/14 tire will have a slightly shorter sidewall at the expense of a wider footprint. Less "ballooning" of the sidewall past the edge of wheel, if that makes sense. From the tire calculator:
Tire Height (Diameter) 23.6 in 601 mm 23.5 in 596 mm
Sidewall Height 4.8 in 123 mm 4.7 in 120 mm
Tire Width 6.9 in 175 mm 7.3 in 185 mm
Re: Too Much Negative Offset?
Posted: Fri Apr 28, 2023 4:22 pm
by Rutty
Here's a 185/65R14. It has about .340" clearance. So roughly 4mm less clearance than the 175/70R14.
Re: Too Much Negative Offset?
Posted: Fri Apr 28, 2023 9:34 pm
by Gregs672000
I like the wheels. Would this be a good candidate for the 'ol fender roll? i.e. using a large wood dowel to roll the inner fender lip. I think you can cut a few small reliefs in the inside edge to help it roll up without stressing the paint, but I don't know if its required. You would gain a lot of clearance. Love the yellow and black together. I might consider painting the wheel centers black to get the fins to stand out and polish them up nice. And maybe black on the sides of the fins too...? The angled side view pic you posted made me think of it...
Re: Too Much Negative Offset?
Posted: Fri Apr 28, 2023 10:14 pm
by Alvin
Rutty wrote: ↑Fri Apr 28, 2023 4:22 pm
Here's a 185/65R14. It has about .340" clearance. So roughly 4mm less clearance than the 175/70R14.
I'm impressed by how many tire sizes you have access to!
175/65/14 will be your sweet spot...I know you have it
Re: Too Much Negative Offset?
Posted: Sun Apr 30, 2023 9:09 pm
by Rutty
Alvin wrote: ↑Fri Apr 28, 2023 10:14 pm
Rutty wrote: ↑Fri Apr 28, 2023 4:22 pm
Here's a 185/65R14. It has about .340" clearance. So roughly 4mm less clearance than the 175/70R14.
I'm impressed by how many tire sizes you have access to!
175/65/14 will be your sweet spot...I know you have it
Hahaha! I have two roadsters, both with stock rims. One had the 185/65R14's and the other 175/70R14's.
I'll clean these aluminum rims up and have a new set of 170/70R14's put on them.
Re: Too Much Negative Offset?
Posted: Sun Apr 30, 2023 9:11 pm
by Rutty
Gregs672000 wrote: ↑Fri Apr 28, 2023 9:34 pm
I like the wheels. Would this be a good candidate for the 'ol fender roll? i.e. using a large wood dowel to roll the inner fender lip. I think you can cut a few small reliefs in the inside edge to help it roll up without stressing the paint, but I don't know if its required. You would gain a lot of clearance. Love the yellow and black together. I might consider painting the wheel centers black to get the fins to stand out and polish them up nice. And maybe black on the sides of the fins too...? The angled side view pic you posted made me think of it...
Thanks!
I was thinking the same thing. Polish them up and paint the webbing and sides of the spokes black.
Re: Too Much Negative Offset?
Posted: Mon May 15, 2023 8:12 pm
by Rutty
I found some time to start cleaning the rims and have a question. How clean do they have to be before paint will stick? I don't want to do them again in a few years, this is a lot of work!
Primed and painted one web area to see how well it sticks before I do them all.