| Author |
Message |
Bob Baldwin (Bob4106) (69.132.84.145)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 27, 2004 - 8:19 pm: | |
I have a 4106 with a 8v71 4 speed. How much will I hurt my top speed. Or will it be the same. If I use 285/75R24.5 all the way around |
TWO DOGS (4.227.112.199)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 27, 2004 - 8:59 pm: | |
will help your speed & cut down on your hill climbing power...guess it depends on wheather you are a flatlander or not... |
Henry van de Graaf (Hcvdg) (172.192.100.216)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 27, 2004 - 9:16 pm: | |
Here's the path to a speed calculator. You will need to know the RPM of your tire (no, not that RPM)- Revs Per Mile.
http://home1.gte.net/res07rfl/4106/calcmph.htm |
DonTX/KS (66.82.9.48)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, April 27, 2004 - 9:41 pm: | |
And don't forget there are Hi-tred and Lo-pro tires in the 24.5 size, gives you some choices. |
RJ Long (66.229.97.200)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 28, 2004 - 3:14 am: | |
Bob -
To help you answer your question, here's some background information for you:
GM engineered the powertrain of the 4106 to run 60 mph at 1650 rpm using 10.00x20 tube-type tires that turned 495 revs per mile. That last figure is the key to your question's answer.
Tires that turn MORE than 495 revs/mile will give you a slightly lower top speed, slightly lower fuel mileage, but slightly better hill-climbing ability.
Tires that turn LESS than 495 revs/mile will have the opposite effect.
You must decide which is best for 90% of your major running. I mention that 90% figure, because if you only go climbing the Rockies once a year, it doesn't make sense to put the smaller tire on for it's advantage in that situation.
Be aware also that there are some "bus" tires out there that are specifically designed for city transit use, and have a 50-55 mph speed rating. These tires have a much heavier sidewall to them, as transit drivers like to use the tires and curbs as part of the coach's braking system! These are NOT designed for continuous highway usage, so do your homework.
The calculator that Henry mentioned, btw, is excellent for helping you find the answer to your question also, but you need to know the DIAMETER of the tire to make it work properly. This info can be found in the tire's specs, and most of the major manufacturers list this on their websites.
Oh, and since you have a 4106, don't forget, when using the calculator, to factor in the angle drive ratio, too!
HTH,
RJ
PD4106-2784
Fresno CA |
James Maxwell (Jmaxwell) (66.81.58.6)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 28, 2004 - 11:46 am: | |
All other factors being equal, as I recall the differences gained or loss from the largest to smallest, or vice-versa, is about 7%. There are factors that go beyond this though, such as tread width and ply ratings, which effect the ride and handling. Over-sizing tires on a relative lightweight like an 06 may not be the best of ideas. |
Daris (209.67.181.129)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 28, 2004 - 12:23 pm: | |
The speed calculator that Henry mentioned can now be found at http://www.freewebs.com/darisb/
Regards,
Daris |
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