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Discussion Starter · #1 ·
hi guys newbie here..

i know most of you guys here recommend 255x45 on 20" rims..however those tires are not available so i ended up getting 275x40. I just want to know from you guys if I made the wrong move and should have waited a couple of days to get the recommended size?

From what I see the ones I have are slightly bigger compared to 255's so I want to know what would be the effect on the car in terms of parts like axle, wheel bearings, etc..

will it shorten the lifespan of the parts? what about my fuel consumption?

:wall: :wall: :wall:
 

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I don't really know much about tires this size, but I'll give you a link to my new favorite tire calculator: LINK

Also, welcome to the City! :welcome:
 

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achilles said:
i know most of you guys here recommend 255x45 on 20" rims..however those tires are not available so i ended up getting 275x40
same situation as me, mine are slightly bigger than yours, 275/45

achilles said:
I want to know what would be the effect on the car in terms of parts like axle, wheel bearings, etc..
will it shorten the lifespan of the parts? what about my fuel consumption?
I went through wheel bearings (front) and as far as I know thats a normal wear part on the escapes anyways, larger wheels might speed the wear process up a bit though... Fuel consumption, not sure. I haven't had any other problems related to the wheels/tires.
 

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what does that + approx 31"? My mech said that 31 will be okay but anything larger will add extra wear on the gearing and these Esacapes are $$ to change the gearing out. I wouldn't go any larger. Also, your speedo may be off by a few MPH.
 

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Discussion Starter · #6 ·
Guys,

this site says that if you go over 3% diameter of the original tire, you might end up facing brake failure. but personally, i think it depends on your driving habit.

http://www.1010tires.com/TireSizeCalcul ... ion=submit

I'm sorry guys, i have no idea yet to upload some pictures so try to use the link or check below. another thing that i am confused of is the actual speed..
so basically if my speedometer says 60mph i am actually running 58.3 using tire 2? is that correct?

Stock Tire - 215/70R16
Section Width: 8.46 in 215 mm
Rim Diameter: 16 in 406.4 mm
Rim Width Range: 5.5 - 7 in
Overall Diameter: 27.85 in 707.39 mm
Sidewall Height: 5.92 in 150.36 mm
Radius: 13.92 in 353.56 mm
Circumference: 87.49 in 2222.2 mm
Revs per Mile: 746.8
Actual Speed: 60 mph 100 km/h
Speedometer Difference: -
Diameter Difference: -

Tire 1 - 255/45R20
Section Width: 10.03 in 255 mm
Rim Diameter: 20 in 508 mm
Rim Width Range: 8 - 9.5 in
Overall Diameter: 29.03 in 737.36 mm
Sidewall Height: 4.51 in 114.55 mm
Radius: 14.51 in 368.55 mm
Circumference: 91.20 in 2316.4 mm
Revs per Mile: 716.5
Speedometer1: 57.5 mph 95.9 km/h
Speedometer Difference: 4.228% too slow
Diameter Difference: 4.07%

Tire 2 - 275/40R20
Section Width: 10.82 in 275 mm
Rim Diameter: 20 in 508 mm
Rim Width Range: 9 - 11 in
Overall Diameter: 28.66 in 727.96 mm
Sidewall Height: 4.33 in 109.98 mm
Radius: 14.33 in 363.98 mm
Circumference: 90.03 in 2286.7 mm
Revs per Mile: 725.7
Speedometer1: 58.3 mph 97.1 km/h
Speedometer Difference: 2.907% too slow
Diameter Difference: 2.83%

Tire 3 - 275/45R20
Section Width: 10.82 in 275 mm
Rim Diameter: 20 in 508 mm
Rim Width Range: 8.5 - 10 in
Overall Diameter: 29.74 in 755.39 mm
Sidewall Height: 4.87 in 123.69 mm
Radius: 14.87 in 377.69 mm
Circumference: 93.43 in 2373.1 mm
Revs per Mile: 699.3
Speedometer1: 56.1 mph 93.6 km/h
Speedometer Difference: 6.792% too slow
Diameter Difference: 6.36%
 

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Your post has the % of the speedometer being too slow, so if you want to go 50 according to your speedo, you are actually going slightly more than that. Try to find one of those speed detector things the police put up to verify, or use a GPS, those tell you your speed.
I know my speedometer is off by quite a bit... 55 km/h when the speedo says im going 50 km/h.

megascape said:
My mech said that 31 will be okay but anything larger will add extra wear on the gearing....
31's wouldnt fit without a lift kit anyways on the escape as far as I can tell... on the last post it says that my total diameter is 29.74 inches, and even that rubs so....
 

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31" has a slight rub, but depending on what your going to use it for there is no sense in trimming the wheel well in the rear part of the fender well unless you tend to off-road it regularly. Also the mechanic who helps me is a professional off-road/rock crawler like Lord SUV, and Jants says wheel rub is not as big a deal as people make it out to be because eventually it will wear a pattern in the tire.
I currently ride 30" and have a 1.25" coil lift in the front and have plenty of room. I think it would work fine w/o the lift. I see lots of "E" with 30" tires that are daily drivers...keep us all posted and best of luck with whatever you choose to do.....
 
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