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Old 10-20-2003, 05:25 PM   #1 (permalink)
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Default Wheel and Tire specs

Hi all,
I see this get asked a lot in other posts so I've compiled all of the info I could find on the Stock wheels and tires.

Stock Wheel
Mfg: Asahi Tec Corporation
Size: 14 x 5.5 J
Bolt Pattern: 4-100mm
Lug Size: 12 x 1.5mm
Offset: +45H
Weight: 11 lbs
Finish: Aluminum
Style: 12 slot

Stock Tire
Mfg: Bridgestone
Model: Potenza RE92
Size: 165/65 R14
Compound: 78S
Treadwear: 260
Traction: A
Temp: B
Weight: 11.5
Pressure: 44psi
RPM: 926

The following tire sizes are currently available to fit the stock wheel from major tire chains.

165/65 R14
175/65 R14 -2.3 MPH difference at speedo, 908 RPM
185/60 R14 -1.3 MPH difference at speedo, 914 RPM
195/55 R14 0.0 (same as stock)

Note:
The Maximum fitment tire and wheel size for the Insight is the 205/40 R16x7 while retaining the same tire diameter. And yes, this size fits quite easily behind the wheel skirts.
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Old 10-21-2003, 04:39 AM   #2 (permalink)
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Thanks Sparky5501. But which of those replacement tyre sizes has the lowest profile? Presumably 175/65?
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Old 10-21-2003, 09:06 AM   #3 (permalink)
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The second number is the profile so 195/55R14 has the lowest profile of the tires listed.

Even with a brand new Insight on OEM tires when your speedo says you driving at 100 km/hr you are really travelling at 98 km/hr. Yes, this means in reality your fuel consumption is 2% worse then you think!
The truth hurts!
Test it yourself with a GPS.

So 185/60R14 tires would actually increase the accuracy of your speedometer and odometer.
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Old 10-21-2003, 01:52 PM   #4 (permalink)
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Quote:
Originally Posted by Guillermo
So 185/60R14 tires would actually increase the accuracy of your speedometer and odometer.
Perfect! Glad I got that size. Revolutions/mile will also increase as your tires wear down, which is another reason to start on the low side.

This might be a good place to dump our new tire/wheel specs as well, for those of us who have punted the Potenzas. I have Cooper Lifeliner SLE, 185/60 R14, 82H, 420AA. No particular reason -- just went to a tire shop and these had the best wear rating and quietest ride.
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Old 10-21-2003, 04:20 PM   #5 (permalink)
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Quote:
Perfect! Glad I got that size. Revolutions/mile will also increase as your tires wear down, which is another reason to start on the low side.
Yes this is true. Your tire makes fewer revolutions to cover the same distance as the stock tire.

Several factors are at play with larger diameter tires. First one being weight. The new tire is a few pounds heavier than the stock. Second, increased friction from the larger contact patch. Third, better conservation of momentum (from more weight and larger diameter) but is hampered by the increased friction. From just glancing at the numbers it is plausable that the 185/60 R14 will give a marginaly better actual output than the stock tires. Even taking into account the false reading from the MPG indicator.

I'm running the HUGE 205/40 R16s right now and my milage has dropped 10 MPG. The tire is the same diameter but the increased friction and weight are requiring more power usage from the engine.
They sure look good and stick like snot on the corners but are a real drag for gas milage. I'm getting 45 city 51 highway with the HUGE tire wheel combo. I guess I'll live with it for a while and switch back to the stock tires when it's summer again.
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Old 10-21-2003, 11:41 PM   #6 (permalink)
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Default Re: Wheel and Tire specs

If the Insight uses 14x5.5" wheels, then you should also be able to use Honda HX wheels ('96-'00) that weight 11lbs and has the same dimensions. I believe the offset is same as well.

What size rotors does Insight use? Does anyone know? If there is a lot of room behind the stock wheel (to clear the caliper), then one might also be able to fit Civic VX wheels which are 13x5", but weigh 8 lbs each.
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Old 10-22-2003, 02:03 PM   #7 (permalink)
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Yes I use 8lb 13" VX rims and they fit great!
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Old 10-22-2003, 10:32 PM   #8 (permalink)
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Guillermo, thanks for the info. That's a very useful info. Now, I am going to save my current VX wheels for my future Insight. [/b]
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Old 10-23-2003, 06:45 PM   #9 (permalink)
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I've only got a few more weeks till my Volk ce28n 14x5.5 with a +45 offset come in from japan. They only weigh 6.5lbs each...
Also plan on using the super light weight Ray's lugnuts. .8 oz each.

I'll probably stick with stock tires and size unless I can find something as light.
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Old 10-24-2003, 08:27 AM   #10 (permalink)
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Cakley,
It would be great if you go to the drap strip or dyno your car before and after you put on your new super light rims to see how much difference it makes.
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