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Old 02-15-2017, 10:36 AM   #1
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tire size suggestions?

okay, so i'm wanting to get new tires, these will be my daily driving tires but i can't decide what size i want.

215/45/17 or 215/35/17

thoughts?

reasons for one of these size:
more low
going on aftermarket wheels.
daily driving
muh stance



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Old 02-15-2017, 11:20 AM   #2
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Neither is correct for your car, 215/50-17 is the stock size:

2012+ Focus Wheel/Tire Guide

Reducing the profile number will get you a shorter side wall, and gear down the car (higher RPM at the same speed), while also throwing off your speedometer reading.
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Old 02-15-2017, 11:50 AM   #3
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Yeah, why do you want to change sizes? Give us that information and we may be able to give some more direction as to what and why.
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Old 02-15-2017, 12:12 PM   #4
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Quote:
Originally Posted by sailor View Post
Neither is correct for your car, 215/50-17 is the stock size:

2012+ Focus Wheel/Tire Guide

Reducing the profile number will get you a shorter side wall, and gear down the car (higher RPM at the same speed), while also throwing off your speedometer reading.
doing a different size as i bought new wheels for my car, also wanting to sit a little lower, so a smaller sidewall means the shorter the tire.
also i'll obviously be getting my speedometer recalibrated.

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Old 02-15-2017, 03:42 PM   #5
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35 is a too low for a daily driver since a bit more sidewall on real world streets goes a long ways toward protecting your wheels. Are the roads well kept? Are you driving it year round?

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Old 02-15-2017, 03:47 PM   #6
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Quote:
Originally Posted by RonMaiden View Post
35 is a too low for a daily driver since a bit more sidewall on real world streets goes a long ways toward protecting your wheels. Are the roads well kept? Are you driving it year round?

Looking cool and being practical don't always go hand in hand.
roads are awesome around here and well kept. i have a winter set and yes i drive the car year round.
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Old 02-15-2017, 07:54 PM   #7
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Having a winter set saves you most of the problem but I would stick with a 45 series and give yourself a decent margin of error between tire and wheel.

I go with a slightly narrower 17" Hankook winter combo (215/50s) on my STI but once May shows up it's back to 245s on the stock 18"s and Michelins.
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Old 02-16-2017, 07:00 AM   #8
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I have 205/45r17 on my new wheels and after getting them in the mail I'm glad I didn't go with a lower profile tire. It fills the wheel well just right with a 2" drop



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Old 02-16-2017, 08:19 AM   #9
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Well, personally I would still stick to the 45 series as 35 will be pretty rough riding/susceptible to popping off the wheel if you do manage to hit a pothole or just a bump in the road. 35 would also greatly effect your gearing whereas 45 not as much. How much have you lowered your car?
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Old 02-16-2017, 10:08 AM   #10
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06 Acura TSX 6MT stock tire size is 215/50-17 (25.5" OD) or 225/45-17 (24.9" OD) with optional OEM lowered A-Spec struts: I have 225,000 miles on mine, and have gone through a pile of tires, all-season and snow, of different sizes but all on 7" rims. Some thoughts on different sizes:

215/50-17 OEM: not as many choices as 225/45-17; TSX needs 92 load rating since it is very nose heavy; a compromise size for lateral grip vs snow performance defeated by OEM tire selection. New set of DWS had the front end of the car sliding everywhere, which was fun but wore out the side edges of the tires quickly. They worked in the snow, but I prefer snow tires.

225/50-17: Continental DWS, the only set of tires I have ever driven to the wear bars, on the street; because they kept their wet-weather grip until the end. I enjoyed the handling with this size, plus most city corners were more engaging because I started using 2nd and 3rd (or both) gears for corners, vs almost lugging the engine using 3rd almost exclusively; I stopped using 6th gear in the city; 6th became a hwy gear only but if I needed to accelerate a bit to move through traffic I typically downshifted to 5 (whereas with 215/50-17 I used to just hit the gas). The car was and felt slower to accelerate, and I did not save any gas because the torque-less engine often had to work harder.

225/45-17: This is my preferred size, and the car seems to do everything well. The difference in acceleration between the over-sized 225/50-17 and this was very noticeable. I regret not needing 2nd gear for many city corners, but the car has thrust everywhere in every gear. Fuel economy is very good.

Acura Snow tire 205/60-16 (on 7"): Slightly taller (25.7" OD) than OEM all-season, this is good for deep snow, but everywhere else the car understeered a lot, and I wore the sides of the tread too quickly - because that's the way I drive and the car is heavy and understeers - only making handling worse.

Acura Snow tire 215/55-16 (on 7"): This is my preferred option. I live north of Toronto, so I see snow, and we ski. The TSX is heavy, but understeers less with this tire. I know that the smaller diameter keeps acceleration on par with the 225/45-17 all-season tires I use, and this means that my spare tire in the trunk (I always carry a full-size tire) works well if I need to change a tire 200 miles from home. When there's less snow around, this tire size is more fun to drive with, and gives better traction for acceleration, braking and handling, plus its gearing advantage for acceleration.

Thoughts on 2012 Focus tire size: Depending upon model, the Focus comes with different OEM tire sizes. I have 215/55-16 (25.3" OD) all-season and 205/65-15 (25.7" OD) snow tires. Some cars came with 195/55-16 (I recall, @ 25.0" OD), or is at least considered a good snow tire size; this size tire has virtually the same diameter as the 225/45-17 (24.9" OD). The Focus almost weighs 3,000 lb, and its traction control is smarter than my Acura's, so it has enough weight and brains to use a larger tire for winter traction - meaning I would not use a 195/55-16 snow tire, especially if I had 1,000lbs of people and skies and stuff in/on the car. The 215/50-17 (25.5" OD) rounds out the OEM sizes, and shows that a range seems acceptable to Ford.

I believe that you want less torque at the road in snow, which is why I favour the 205/65-15, which likely understeer less in the dry/wet, plus mine have a high load rating, .

My next set of all-season tires will be 225/50-16 (24.9" OD), and I'm thinking about the Continental DWS 06. They have the load rating, supposedly work in all weather and have stiffer sidewalls than the DWS, and the "acceptable" smaller overall diameter should improve acceleration a bit, while maintaining good fuel economy. Plus, I know that if I keep the speedo just below 120kph (visually easy to do while driving) the car is actually moving along at about 116kph, and I can [almost] drive with impunity.

Last edited by gdcwatt; 02-16-2017 at 10:13 AM.
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