smaller diameter tires pros and cons? - Ford Mustang Forum
Reply
 
LinkBack Thread Tools
post #1 of 19 (permalink) Old 04-08-2013 Thread Starter
Made Member
 
rustang3232's Avatar
 
Joined: Feb 2011
Location: bay area
Posts: 258
 
smaller diameter tires pros and cons?

Will I benefit from getting a smaller diameter tire I heard it is like changing gears?

Also what is to small my stocks according to tirerack is 28"

2013 ingot silver v6 auto
Atak ab/BBK TB/91R/K&N Drop-in/3.73/Alum DSS/upr lca 272whp/248wtq :yelpleased: airaid cai,BBK shorties, 18" sve drifts
rustang3232 is offline  
Sponsored Links
Advertisement
 
post #2 of 19 (permalink) Old 04-08-2013
BOSS Member
S197 Member
 
randeez11's Avatar
 
Joined: Jun 2010
Location: Windsor
Posts: 4,851
 
I dont think your stock tires will be 28" closer to 27" and if you go smaller in diameter than that, it wil look funny IMO.

2011 GT. Grabber Blue. Procharged. 3:73 manual.Billit LCA's. Corsa Extremes. GT 500 wheels. Racemaster DR's. T-56 Tremec. Dynotech DS . Centerforce DF. American Racing headers/high flow cats 560 rwhp.Donny Walsh tuned

2012 Pony Package. Race Red.3:31 automatic.BBK longtubes and catted X.FRPP Sport axlebacks. BBK throttle body. Dynotech DS. Brembo wheels and tires. Strut tower brace. Airraid CAI. Bama tuned.
randeez11 is offline  
post #3 of 19 (permalink) Old 04-08-2013 Thread Starter
Made Member
 
rustang3232's Avatar
 
Joined: Feb 2011
Location: bay area
Posts: 258
 
P215/65R17 michelin energy saver a/s 28"

Michelin*Energy Saver A/S

of course fender gap will be ugly but im thinking performance you don't feel aesthetics on your car.

2013 ingot silver v6 auto
Atak ab/BBK TB/91R/K&N Drop-in/3.73/Alum DSS/upr lca 272whp/248wtq :yelpleased: airaid cai,BBK shorties, 18" sve drifts
rustang3232 is offline  
post #4 of 19 (permalink) Old 04-08-2013
PONY Member
V6 Member
S197 Member
 
vivix's Avatar
 
Joined: Mar 2012
Location: Nope
Posts: 503
 
you'll get a small gearing increase, your speedo will be off a little, gas mileage may go down a little.

Depends on what size you're looking at but I went from my stock 225/60/17's to 275/40/18's and love the change (27.6" to 26.7"). I still have 2.73's out back though so every little bit helps. Its a 3.5% difference with those numbers so probably not worth it just based on that. Go a lot wider and it is

==2012 Kona Blue Mustang V6==
==1995 Neon Coupe==
vivix is offline  
post #5 of 19 (permalink) Old 04-08-2013
MACH I Member
 
Joenpb's Avatar
 
Joined: Feb 2011
Location: San Diego
Posts: 2,627
 
Quote:
Originally Posted by rustang3232 View Post
P215/65R17 michelin energy saver a/s 28"

Michelin*Energy Saver A/S

of course fender gap will be ugly but im thinking performance you don't feel aesthetics on your car.
I don't understand putting 3.73 gears on your car, then thinking about putting thin fuel savings tires on. Huge oxymoron that is.
Joenpb is offline  
post #6 of 19 (permalink) Old 04-08-2013 Thread Starter
Made Member
 
rustang3232's Avatar
 
Joined: Feb 2011
Location: bay area
Posts: 258
 
those are my stock tires i was looking at alot of tires at like 26" lmao no way i will buy those unless i really can not afford better.

2013 ingot silver v6 auto
Atak ab/BBK TB/91R/K&N Drop-in/3.73/Alum DSS/upr lca 272whp/248wtq :yelpleased: airaid cai,BBK shorties, 18" sve drifts
rustang3232 is offline  
post #7 of 19 (permalink) Old 04-08-2013
GT Member
5.0L Member
S197 Member
 
powerwhee's Avatar
 
Joined: Dec 2011
Location: LA
Posts: 2,155
 
I have a smaller tire diameter than stock. I don't think it looks weird, and I do notice the increased gearings. It's about 400 rpms higher in every situation with the tires. 40 mph 2nd gear with stock tires id be at 3600 rpm. with my shorter than stock tires im at 4100 rpm or so. And on the upshifts I'm over 5k at every upshift which is also good for power. I like em alot

1st Time at the 1/4 Mile Best E.T out of 4 passes (Without Ported Intake Manifold):
Uncorrected 2500DA 13.5@105.69 MPH w/ a 2.17 60".Corrected 13.3@107 MPH
Ford Racing 4.10 Gears/ Borla S Type Axleback/BBK Chrome Equal Length Shorties/Lethal Performance Catless H Pipe/JLT CAI/Ported Upper and Lower Intake Manifolds/Steeda 91 Octane Tune/ SR Springs
powerwhee is offline  
post #8 of 19 (permalink) Old 04-08-2013 Thread Starter
Made Member
 
rustang3232's Avatar
 
Joined: Feb 2011
Location: bay area
Posts: 258
 
do you know over all diameter? maybe also post a pic up?

2013 ingot silver v6 auto
Atak ab/BBK TB/91R/K&N Drop-in/3.73/Alum DSS/upr lca 272whp/248wtq :yelpleased: airaid cai,BBK shorties, 18" sve drifts
rustang3232 is offline  
post #9 of 19 (permalink) Old 04-08-2013
GT Member
5.0L Member
S197 Member
 
powerwhee's Avatar
 
Joined: Dec 2011
Location: LA
Posts: 2,155
 
Yea my overall diameter is 26.8 inches. They're 245 45 18 size.


Sent from AutoGuide.com Free App
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	183
Size:	846.9 KB
ID:	211017  

1st Time at the 1/4 Mile Best E.T out of 4 passes (Without Ported Intake Manifold):
Uncorrected 2500DA 13.5@105.69 MPH w/ a 2.17 60".Corrected 13.3@107 MPH
Ford Racing 4.10 Gears/ Borla S Type Axleback/BBK Chrome Equal Length Shorties/Lethal Performance Catless H Pipe/JLT CAI/Ported Upper and Lower Intake Manifolds/Steeda 91 Octane Tune/ SR Springs
powerwhee is offline  
PONY Member
 
740weapon's Avatar
 
Joined: Dec 2010
Location: Salem
Posts: 605
 
235 55 r17 is a very good choice for the 17x7 rims.
245 45 r18 is a good size for 18x8 rims. Mostly because higher performing rubber is available in those sizes.

2012 V6 Base. 6-speed. 3.31. Roush Wheel Hop Kit. Brembo GT Suspension. Camber Mod. Airaid Intake. 91R-AUTOX Bama Tune. Carbon Fiber Trac-Lok. Spec Al Flywheel, 18x10.5 Enkei Wheels. 285 35 R18 RS-3 Tires.
740weapon is offline  
MACH I Member
 
Joenpb's Avatar
 
Joined: Feb 2011
Location: San Diego
Posts: 2,627
 
Quote:
Originally Posted by powerwhee View Post
Yea my overall diameter is 26.8 inches. They're 245 45 18 size.
I have a similar size 255x45x18, and like em'. They have good grip, don't rub at all, and I can rotate em'.


Joenpb is offline  
MACH I Member
 
2VipeRS's Avatar
 
Joined: Apr 2011
Location: Bismarck
Posts: 2,666
 
Quote:
Originally Posted by vivix View Post
you'll get a small gearing increase, your speedo will be off a little, gas mileage may go down a little.

Depends on what size you're looking at but I went from my stock 225/60/17's to 275/40/18's and love the change (27.6" to 26.7"). I still have 2.73's out back though so every little bit helps. Its a 3.5% difference with those numbers so probably not worth it just based on that. Go a lot wider and it is
Actually, depending on the weight of the new setup, you could be getting better gas mileage. Dropping rotational mass increases fuel efficiency, which is usually a bit offset by change in gears, so it normally evens out unless you have an unusually high % reduction in weight.

However, it doesn't change the final gear by much. I reduced the diameter of my OE wheels by 2.5" and is the equivalent of going from 3.31 final drive to 3.49. Figured out by cross multiplication table of circumference.

A/B = X/Y

A = OE Tire Circumference
B = OE Final Drive Ratio
X = New Tire Circumference
Y = New Final Drive Ratio (unknown value)

Tire Circumference = pi x tire diameter

Takes a big reduction in diameter to get a little change in final drive ratio.

2012 Black 3.7L
=Performance Package

2VipeRS is offline  
GT Member
5.0L Member
S197 Member
 
powerwhee's Avatar
 
Joined: Dec 2011
Location: LA
Posts: 2,155
 
Yea it's not a huge chang, maybe 300-400 Rpms, but its enough to put the car in the powervand a lot nicer when mashing it from 40 mph and when up shifting gears


Sent from AutoGuide.com Free App

1st Time at the 1/4 Mile Best E.T out of 4 passes (Without Ported Intake Manifold):
Uncorrected 2500DA 13.5@105.69 MPH w/ a 2.17 60".Corrected 13.3@107 MPH
Ford Racing 4.10 Gears/ Borla S Type Axleback/BBK Chrome Equal Length Shorties/Lethal Performance Catless H Pipe/JLT CAI/Ported Upper and Lower Intake Manifolds/Steeda 91 Octane Tune/ SR Springs
powerwhee is offline  
Apprentice
 
FuelforFire87's Avatar
 
Joined: Apr 2011
Location: Lemont
Posts: 211
 
I changed my stock rims and tires (energi-savers) to the GT500 rims and sumitomo tires (255/45/18 front and 275/40/18 rear). at 75 mph your engine rpm is only going to go up about 100rpm (2208rpm to 2315rpm for the autos). I did notice a 1 mpg loss according to the computer, but the computer isn't completely accurate so its hard to say. I did notice however slightly better acceleration and a lot better traction over the stock tires.

2014 GT Black 6R80, Procharger Stage 2 D1SC, Lund Tuned, BBK 85mm Throttle Body, BBK Ceramic Headers & Offroad X-pipe, Lethal Performance over axle pipes, Magnaflow Street AB, Shaft Masters DS, Eibach Pro System Plus, J & M LCA's, Whiteline Relocation Brackets, BMR Adjustable Panhard Bar, Steeda Adjustable UCA & Mount, Bob's Oil Catch Can, GT500 wheels, Nitto NT05R Tires.

FuelforFire87 is offline  
Apprentice
 
FuelforFire87's Avatar
 
Joined: Apr 2011
Location: Lemont
Posts: 211
 
Also, there will be more wheel gap (espically in the rear) so I am definitely planning on lowering my car in the future. For now its bearable enough to live with, as the new rims and tires look 1000 times better.
Attached Thumbnails
Click image for larger version

Name:	20130310_205204.jpg
Views:	103
Size:	612.5 KB
ID:	211105  

2014 GT Black 6R80, Procharger Stage 2 D1SC, Lund Tuned, BBK 85mm Throttle Body, BBK Ceramic Headers & Offroad X-pipe, Lethal Performance over axle pipes, Magnaflow Street AB, Shaft Masters DS, Eibach Pro System Plus, J & M LCA's, Whiteline Relocation Brackets, BMR Adjustable Panhard Bar, Steeda Adjustable UCA & Mount, Bob's Oil Catch Can, GT500 wheels, Nitto NT05R Tires.

FuelforFire87 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:
OR

Log-in









Random Question

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183