New Tires

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New Tires

Postby Mtflyr » Tue Aug 15, 2017 12:45 pm

Thought I'd post this info on new tires I just got. For my 15" Wide Five rims tires are getting hard to find that look period diameter in the sizes that I had on. I had Kumho all season 165/80/15 front and 195/65/15 rear the diameter and widths of these were perfect for my car with a 25"+ diameter but Kumho no longer has them.

I talked to Carey at SE/Beck and he gave me great recommendations. I thought about Yokohama Avids but the diameter was a good 2" smaller.
I bought Vredestein's as the diameter and width sizes were almost the same as my Kumho's. I got the front 175/15's, 25.7" diameter and the rear 185/15's, 25.4" diameter.

They look great and the ride is very good the only draw back is they are a Summer tire. I kept my Kumhos as they apper to be in great shape but I was getting too nervous as they were over 9 years old. The Vredestein's are a bit pricey though. Had them mounted, with new stems and balanced on the rims that I brought in (with my adapter in hand) for $599.68.

Pete
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Re: New Tires

Postby Carlos G » Tue Aug 15, 2017 4:04 pm

I've been interested in the Vredesteins. Can you get some pictures with the car out in the day light?
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Re: New Tires

Postby Mtflyr » Wed Aug 16, 2017 5:06 am

Carlos,
Here's a few pic's today outside. I tried to play with the light to give a better view of the tires.

Pete
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Re: New Tires

Postby albaran » Wed Aug 16, 2017 7:39 am

In other posts, I complained about my engine winding to high on the highway. I don't want to get into changing gears but I was wondering how much taller tires would help. My current tires are between 23-24" in diameter and was thinking of replacing them with tires that would be closer to 26" . How much would that drop the rpms in 4th gear?
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Re: New Tires

Postby Mtflyr » Wed Aug 16, 2017 8:44 am

Sorry, I've no idea and won't be able to check until next week.
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Re: New Tires

Postby EEricson » Wed Aug 16, 2017 5:35 pm

Look at this site.
http://www.advanced-ev.com/Calculators/TireSize/
You'll have to calculate your diff ratio by multiplying your r&p by 4th gear for a final drive, i.e., .89 x 3.88= 3.45

Then you can play with tire sizes and/or different r&ps all day.

In this example, a 25.4 diameter tire (165/80-15) with a 3.44 r&p and .93 4th gear (3.19 final drive) gives a speed at 3000 rpm of 71 mph. That's about what I get in Bridget, according to my speedometer, so I know the calculator is close to right.

a 23.5-inch tire would drop the speed to about 65.5 mph at 3000 rpm.

If you're running the .89 and 3.88 combo, those low profile tires only get you to 60 mph. The tall 80 series 165s make almost 66 mph at 3000.

So, a 10 percent difference: tire size does have an effect commensurate with small gear changes.
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Re: New Tires

Postby albaran » Thu Aug 17, 2017 7:22 am

Six miles per hour is ok. I have to replace the 9 year old tires anyway.
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Re: New Tires

Postby EEricson » Thu Aug 17, 2017 4:13 pm

Pete I think those look exactly right. I'm gonna copy you with my car.
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Re: New Tires

Postby egrant5329 » Fri Aug 18, 2017 7:22 am

Pete,
Did you ever have any rubbing on the inside front passenger side with the 165/80/15 tires?
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Re: New Tires

Postby Mtflyr » Fri Aug 18, 2017 1:29 pm

No Ed but I hardly ever have anyone in the right side.

I've never had any rubbing on either side🙂
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Re: New Tires

Postby dlearl476 » Fri Sep 01, 2017 10:08 pm

Mtflyr wrote:Thought I'd post this info on new tires I just got. For my 15" Wide Five rims tires are getting hard to find that look period diameter in the sizes that I had on. I had Kumho all season 165/80/15 front and 195/65/15 rear the diameter and widths of these were perfect for my car with a 25"+ diameter but Kumho no longer has them.

I talked to Carey at SE/Beck and he gave me great recommendations. I thought about Yokohama Avids but the diameter was a good 2" smaller.
I bought Vredestein's as the diameter and width sizes were almost the same as my Kumho's. I got the front 175/15's, 25.7" diameter and the rear 185/15's, 25.4" diameter.

They look great and the ride is very good the only draw back is they are a Summer tire. I kept my Kumhos as they apper to be in great shape but I was getting too nervous as they were over 9 years old. The Vredestein's are a bit pricey though. Had them mounted, with new stems and balanced on the rims that I brought in (with my adapter in hand) for $599.68.

Pete


Pete, I wouldn't worry too much about them being a "summer tire." I don't know what compound they are using on the classics but back in the day I used Sprints on my Volvo 145 (185/65-R15s, IIRC.) and they were great snow tires. I doubt you'll be driving your Spyder in any weather that will be too much for them.*

Aside from the price, I'd give them serious consideration, but 78 series tires rub on my Beck.

*Then again, I'm in favor of softer compound tires. I just bought a set of M+S tires for my car. They only matched set I could find in 185/65-R15 and 205/60-R15 (other than Michelin X-Ice for $100+/ per) were Solar 4XS (??? Supposedly made in a Sumitoyo factory that makes Dunlops) at Walmart for <$200 for the set.
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Re: New Tires

Postby danstern » Sat Sep 02, 2017 5:45 am

It will drop the rpm by 2-3% to go from 23/24 to 26. It just the ratio increase.
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