Help With Tire Size For Ksport Lowering Springs

[DaBlackPearl]

In the old days I just cut springs to get the desired stance but I will admit that I am not a super skilled mechanic and I don't want to hurt my Pearl and want to do it right.



I just ordered new rims the same size I have now 20 x 8.5 I know that some will say that I should go 22" but I just don't want big wheels. Anyway, I want to lower Pearl with some springs that someone keeps telling me to get... Cough..Julio...Cough and the tire size that I have is 245 45 20. This is the tallest tire I could go with my 20's to try to fill the gap.



The question is if anyone knows if I am going to ok with these or do I need to get 245 40 20. My tire guy said to ask the manufacturer of the spring kit the max tire size recommended which I asked the seller and they did not have that info. The back wheels look like they will be ok but I am worried about the front which looks like it will be close once everything settles. I was also told that when turning I might have an issue.

I believe the formula for this is that the max diameter should not exceed 28.5" and no wider than 10" but I am hoping that someone out there knows the magic answer before I order the tires.What I might end up doing is lowering it on the wheels and tires that I have now so that if there is rubbing I know to get the 245 40 20



Please Help!!



Thanks!

[BOS/SRT]

go to this site, http://1010tires.com/TireSizeCalculator.asp and get the exact differences and that will give you a better idea on your space. i would think that it wouldn't be an issue, especially with 8.5 width wheels. the only issue i would think of, is the front upper arm bolt. i just shaved mines down a little and no issues.

[DaBlackPearl]

Originally Posted by BOS/SRT go to this site, http://1010tires.com/TireSizeCalculator.asp and get the exact differences and that will give you a better idea on your space. i would think that it wouldn't be an issue, especially with 8.5 width wheels. the only issue i would think of, is the front upper arm bolt. i just shaved mines down a little and no issues.

Thanks Jimmy...That is a cool little tool.

[DaBlackPearl]

I was told about a tire size comparison calculator (Thanks Jimmy) and the size that I was sold 2 years ago turns out to be just a tad over the reccomended max size and I haven't had any trouble so far...*shrug*
Below is a side by side comparison from the stock 215/65/17 and 245/45/20 as well as the overall diameter of the 40 series.

Thanks Jimmy. so far I have learned a lot in a short amount of time. I am liking this site already.

Stock Tire - 215/65R17 >Search Tires Tire 1 - 245/45R20 >Search Tires
Section Width: 8.46 in 215 mm
Section Width: 9.64 in 245 mm

Rim Diameter: 17 in 431.8 mm
Rim Diameter: 20 in 508 mm

Rim Width Range: 6 - 7.5 in
Rim Width Range: 7.5 - 9 in

Overall Diameter: 28.00 in 711.2 mm 215/65/17 (stock)
Overall Diameter: 28.68 in 728.47 mm 245/45/20 (current setup)
Overall Diameter: 27.71 in 703.83 mm 245/40/20

Sidewall Height: 5.50 in 139.7 mm
Sidewall Height: 4.34 in 110.23 mm

Radius: 14.00 in 355.6 mm
Radius: 14.34 in 364.23 mm

Circumference: 87.96 in 2234.1 mm
Circumference: 90.10 in 2288.5 mm

Revs per Mile: 742.8
Revs per Mile: 725.2

Actual Speed: 60 mph 100 km/h
Speedometer1: 58.5 mph 97.6 km/h

Speedometer Difference: - Speedometer Difference: 2.426% too slow
Diameter Difference: - Diameter Difference: 2.38%

[BOS/SRT]

Another standard size for the srt was 255/45-20, which gives it a slight increase in diameter for stock setup and something you can compare it to.
Glad I could help. Let me know if I can help with anything else.

[DaBlackPearl]

Springs are here but I need a new floor jack and some jack stands. I was hoping to have the springs installed this weekend but I'll probably just pay someone to install since I work 12 hours a day. Pics coming soon.

[BOS/SRT]

yeah, the fronts aren't too difficult, but the rears can be pita. keep us posted and don't forget the pix. thanks!

[DaBlackPearl]

Ok...I got her dropped today. These pics are crappy and my Pearl is dirty so I apologize. I just wanted to share. The KSport springs are good quality and are way better than stock. I am not 100% happy with the rear as it only dropped about 1.25 right now so I have a slight rake. I will fix it if it doesn't even out.

Front Before


Rear Before


Front After


Rear After

Overall look.


Better pics soon. After looking at the pics, the rear isn't too bad now...It must have settled a little more driving back to work. *shrug*

Thanks for all the help. Watch for the new tires and wheels getting mounted very soon.

[FinallyCharged]

way better Phil!!! B R A V O!!!

[BOS/SRT]

Congrats! Looks killer now bro! Btw, don't worry she'll drop at least a 1/4 to 1/2 when it settles.! Congrats again!