gears w/ 20's

[jthorn75]

hey when you get bigger rims should go do the gears to kinda like what u do with bigger tires on a truck?

 

[unstoppable]

I do, cause it does affect it.The tire size you go with has a lot to do with it though.
I went with a 245/40-20 and it changed my gear ratio from a 3.55 to a 3.07

 

[Quik LS]

to correct your speedo you'll need to use the SCT XCalibrator - www.fordpartsnetwork.com ask for Torrie.

you should also look at upgrading your brake - as the 20" bring alot more rolling mass.

 

[whatsupadrian]

to correct your speedo you'll need to use the SCT XCalibrator - www.fordpartsnetwork.com ask for Torrie.

you should also look at upgrading your brake - as the 20" bring alot more rolling mass.

Its a lot easier to stop with bigger wheels then it is with smaller ones. More surface area per revolution.
At the same tolken, smaller wheel means faster.

 

[Quik LS]

Its a lot easier to stop with bigger wheels then it is with smaller ones. More surface area per revolution..

wrong.

bigger tire = larger rooling mass = harder to stop.

http://www.detnews.com/2005/autosconsumer/0502/02/G03-76967.htm


Lose weight in the right areas!
Rolling mass is also a good place to start- Heavy rims act like massive flywheels the car has to spin up to speed to get moving.

From the SDML mailing lists-
"I'm surprised I actually read something interesting in this magazine, but has anyone picked up the June issue of Sport Compact Car? There's an editorial called "technobabble" that explains the theory behind rotating weight. We've all heard that "one pound of rotating weight (on the wheels) equals more than three pounds of weight of the car" because that weight is rotating weight, right?"

Chrysler engineer Dave Zelkowski-
It's really related to the moment of inertia. Inertia is not based on the mass as much as geometry. Think of an ice skater spinning during a performance. I'm sure you've noticed that they can spin faster by tucking their arms and legs in. Their mass is exactly the same but by pulling in their limbs they have reduced their moment of inertia. In angular acceleration "torque = moment of inertia X angular acceleration" Therefore " angular acceleration = torque/moment of inertia" Therefore the lower the moment of inertia, the higher the acceleration will be. I really need the Greek alphabet to do this correctly!

I went to lightweight rear tires and rims on the k-car- Not only did it save 36 pounds on the REAR of the car, now I have less rolling resistance AND the 36 pounds is equal to 108 pounds off the body.

 

[whatsupadrian]

wrong.

bigger tire = larger rooling mass = harder to stop.

http://www.detnews.com/2005/autosconsumer/0502/02/G03-76967.htm


Lose weight in the right areas!
Rolling mass is also a good place to start- Heavy rims act like massive flywheels the car has to spin up to speed to get moving.

From the SDML mailing lists-
"I'm surprised I actually read something interesting in this magazine, but has anyone picked up the June issue of Sport Compact Car? There's an editorial called "technobabble" that explains the theory behind rotating weight. We've all heard that "one pound of rotating weight (on the wheels) equals more than three pounds of weight of the car" because that weight is rotating weight, right?"

Chrysler engineer Dave Zelkowski-
It's really related to the moment of inertia. Inertia is not based on the mass as much as geometry. Think of an ice skater spinning during a performance. I'm sure you've noticed that they can spin faster by tucking their arms and legs in. Their mass is exactly the same but by pulling in their limbs they have reduced their moment of inertia. In angular acceleration "torque = moment of inertia X angular acceleration" Therefore " angular acceleration = torque/moment of inertia" Therefore the lower the moment of inertia, the higher the acceleration will be. I really need the Greek alphabet to do this correctly!

I went to lightweight rear tires and rims on the k-car- Not only did it save 36 pounds on the REAR of the car, now I have less rolling resistance AND the 36 pounds is equal to 108 pounds off the body.

i learned something new, interesting

 

[JohnnyBz00LS]

Let me add some clarification .........

I do, cause it does affect it.The tire size you go with has a lot to do with it though.
I went with a 245/40-20 and it changed my gear ratio from a 3.55 to a 3.07

Changing your tire size (OD) does NOT change your gear ratio. It DOES have the same effect as changing your gear ratio, both of which change your speedo-calibration (i.e.: the ratio between driveshaft speed and ground speed). But the ratio between your driveshaft speed and drive wheel speed will be the same regardless of what size tires you wear.

 

[unstoppable]

I think everyone knew what I meant.