Okay i have seen alot of thread about if you have 19"wheels it is harder on the tranny because of the diameter or something. I dont remember the thread but someone pulled out physics formulas and states why a larger wheels is more strain on the tranny and takes more power to turn.

My thing is this, if the outside diameter (rim with tire) is the same, why the hell does it matter? The tranny cant tell if you have 15s, or 18s, or 22s?? It can tell when you change the outside diameter, then I can understand it takes more power

I am NOT taking the weight into consideration, just wheel size.

Dixit

 

i dont think so..

 

I have 19" wheels and my tranny is fine,my acceleration didnt change, and I handle a he*l of alot better. I even did a wider tire size 265-35-19. So to anwser your question the only thing that I could figure out (from my experance) is the weight of the wheels that would make a differance. Meaning 19" Silver painted are lighter then 20"chrome wheels witch in turn does make a major differance in all the aspects I mentioned above.

 

265/35 like whoa! I thought me going to 245/35 was a big change.

 

larger wheels have a greater moment of intertia (more rolling resistance), so yes, that will put slightly more strain on your tranny.

But having passengers in the car does the same thing - put more strain on the tranny, and they'll slow you down a bit too.

It's really not a big deal...

 

Justin: do you have pics of those 265-35's i'd like to see that. i bet they look real big. What company tire and line do you have?

 

I wouldn't sweat it too much

 

well, going bigger and heavier does make you lose hps to the wheels...

from 15s to 17s, i suspect that i lost about anywhere between 5 and 10 hp to the wheels...

 

Now what are the rims size yall yave? like 19x8 or 19x8.5? And what tire sizes?

Just want to know how big are going and it still is not rubbing during turns or hard speedbumps.

Dixit

 

i have 19x8.5 with 245. I think you could go 9.5 with a 255 without much prob if you don't drop it to much.

 

To the question:
Bigger wheels mean more strain on tranny?

Answer:
Yes.


So does a head wind. Too many bugs on the front grill, dice for valve stems.

If you're running the extra same weight 19" rims as 16/17" rim that came stock, your tranny will still suffer (more rotational mass, just because they weigh the same, doesn't mean that have the weight at the same place, more on this later), but not as much as a heavier wheel.

Hypothetical and not using actual numbers or specs...
Let's say a 16" rim with tire weighs in at 36lbs.

Put on a 18" rim with tire weighs in at 36lbs.

At the centre of the 16" rim holds 60% of the weight whereas the lip and "spokes" holds the remaining 40% (including the heavy, 60 series tire).

At the centre of the 18" rim holds 45% of the weight, whereas the lip holds the remaining 55%.

Which rim is ultimately causing more stress to the tranny?

Think of it this way. Get a 3' long rope. Tie a 10lb weight to it. Start swinging it around. Notice the amount of work it requires to getting that weight spinning.

Now get a 6' long rope. Tie a 5lb weight to the end. Notice the difference? Same theory when involving rims. The overall weight of the rim is one thing, where the weight of the rim is located within the construction of it, is another.

Does any of this make sense?

 

This is a response from ForceFed on Russ's site to my thread ...


If weight is a major concearn you should check out Ray's Engineering (Volks). Also keep in mind the overall weight of a wheel is not always the main concearn. Certain wheel manufacturers beef up their wheels in the center (where the lug holes are) this added weight in the center of the wheel has little adverse effect on performance. But makes the wheels stronger. If you were to take that same weight and shift it to the outer edge of the wheel you would lose a lot of performance. Another thing to keep in mind is tire weight. if you are using a light 17" wheel and slap on a heavy 45 series tire all that weight is on the far edge making for horrible performance. I use 19" wheels which compared to other wheels people always say they are too heavy. In reality my wheels are 2 piece and not only is the outer rim portion extremely light but the 35 series tires are also very light. The only heavy portion is right in the middle of the wheel, which I am thankful for every time I hit a pothole. Most racing wheel manufacturers use a test measurement on their wheels known as an inertia test. They put their wheel on a spinning machine (kinda like a tire balancer) and spin it up to a certain speed. Then the machine measures how much power was exerted to get the wheel to that speed. This is the only true test of a wheels performance. The moral to this long boring story is that MOMO makes very strong wheels and I know for a fact that they inertia test all their designs.

 

I can't Spell Either