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nhcruzer
Cruiser Expert
Posted: Mar 29, 2007, 6:50 AM
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Rim size question
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I have 16inch rims now, if I were to go up to 18inch rims would it screw up my speedometer?
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Greg 
nhcruzer "Live in the Moment"
NEPTCC
06 Limited Turbo
Dual Exhaust
Cold air intatake
Inferno undercar lighting
AR Casino Chrome rims
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Posts: 113 | From: New Hampshire
| Registered: Feb 9, 2007, 1:17 PM
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rcktpwrd
Cruiser Addict
Posted: Mar 29, 2007, 11:28 AM
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Re: [nhptwoody] Rim size question
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the rim size won't make a difference, it's the overall diameter of the tire that matters... so by going from a 16" rim to an 18" rim you would have to go down in aspect ratio on the tire size to keep everything as close to the same diameter as possible...
as an example a 16" rim with a 50 series tire would be the same overall diameter as an 18" rim with a 40 series tire...
if you go on TireRack.com and look at the rim/tire options for the PT they will give you everything you need to know...
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Joel
2001 Patriot Blue Touring Edition 5 speed
1976 Oldsmobile Cutlass S [RCKTPWRD]
Click here to see--->My Cars!
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Posts: 757 | From: Raleigh, NC
| Registered: Jun 17, 2001, 12:00 AM
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unctrheels86
Cruiser Fan
Posted: Mar 29, 2007, 12:07 PM
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Re: [rcktpwrd] Rim size question
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I will say that I went up to 18's and the 225/40/18 tires (recommended to keep overall diameter the same) and I do still have a problem with the speedometer being off which I actually had checked to make sure after I got a ticket one time. It is not much of a difference but it goes up with speed. Up to about 35 it reads right but 1 or 2 off at 45, 2 or 3 off at 55, etc. I keep this in account when I am driving but I guess it is good for my odometer to read slow.
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Posts: 10 | From: raleigh,nc
| Registered: Aug 8, 2005, 3:57 PM
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rcktpwrd
Cruiser Addict
Posted: Mar 29, 2007, 1:34 PM
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Re: [unctrheels86] Rim size question
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Quote:
I will say that I went up to 18's and the 225/40/18 tires (recommended to keep overall diameter the same) and I do still have a problem with the speedometer being off which I actually had checked to make sure after I got a ticket one time. It is not much of a difference but it goes up with speed. Up to about 35 it reads right but 1 or 2 off at 45, 2 or 3 off at 55, etc. I keep this in account when I am driving but I guess it is good for my odometer to read slow.
If the tires are the same overall diameter as the stock stuff, then the speedo was probably off from the beginning... which not uncommon...
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Joel
2001 Patriot Blue Touring Edition 5 speed
1976 Oldsmobile Cutlass S [RCKTPWRD]
Click here to see--->My Cars!
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Posts: 757 | From: Raleigh, NC
| Registered: Jun 17, 2001, 12:00 AM
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Midnight Cruiser
Cruiser Expert
Posted: Apr 29, 2007, 7:12 AM
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Re: [unctrheels86] Rim size question
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Instead of using the 225/40/18. You should try the 245/35/18. In the long run this is closer to the original aspect ratio so it will not give any problems. Midnite Cruiser
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MIDNIGHT CRUISER
2005 Midnight Blue Touring Edition,16 in Dealer Option 5 Spoke Silver Alloys/wYokohama Avid V4s 225/50/16 High Performance Tires.
16 in. American Racing Aero Wheels/wYokohama Avid V4s 225/50/16 High Performance Tires,PT Woody Chrome Grill Strips,Chrome Door Handle Scuff Gaurds,Autotecnica Chrome Side Spear Overlaysw/3D PT Cruiser Decals,PT Logo Taillight Covers,Autotecnica Chrome Headlight Trim Rings.TYC Euro Style Performance Reverse Lights, w/purple bulbs & Autotecnica Stainless Steel Trim Rings,E&G Classic PT Cruiser Logo Sill Plates,ERG Slimeline Inchannel Window Visors,15in PhatBoy Flame Etched Antenna,PT LOGO Door Lock Pulls, 1940's Retro Front Fender Spears,Custom Midnight Edition Emblems,Custom Rear Window Vinyl,Airaid Intake System,Custom Color Matched Hood Struts,7 Color LED Interior Light Kit,Purple Under Dash Interior Light Kit, Port Accent -Putco Black Mesh Oval Style Portholes,Stainless ECU Cover,Chrome Vent Covers,Chrome Gauge EyeBrows
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Posts: 226 | From: Sparta,N.J.
| Registered: Apr 17, 2007, 12:49 PM
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slipfit
Cruiser Expert
PT Cruiser Club Member
Posted: Apr 29, 2007, 8:01 AM
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Re: [unctrheels86] Rim size question
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Got a ticket from the State Police about 2 yrs ago ( waived the points (good record) $140 and 1yr prob for 15 over. Found out later my speedometer was off by about 7 mph. Talked to the State Police about it -said it was to late but would've helped at the time. Also they don't even care about us till we hit 10 over, he's got more important things to do, but watch out for the small town cops. The laws don't even require a speedometer in the car, they just expect you to obey the law, however you do it. So it's not a true arguement for speeding.
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If it's gonna happen - it's gonna happen out there.
(This post was edited by slipfit on Apr 29, 2007, 8:03 AM)
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Posts: 358 | From: Columbus, Mi
| Registered: Jan 21, 2007, 3:03 PM
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Bears2005PT
Cruiser Expert
Posted: May 21, 2007, 11:24 AM
Post #7 of 13
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Re: [nhptwoody] Rim size question
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I just went through changing from 15 in to 16 in and i was concerned about this as well. I found a site on the net that really helped out a lot. Go to http://www.miata.net/garage/tirecalc.html. You put in the size of your factory tires and wheels and then you put in the new sizes and it will tell you the difference of the spedometer. Very useful in this type of situation.
Bear
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I have a 2005 Black PT base model
10" Rubber antenna, Purple LiteGlow racing pedals,
Custom Graphics by Ideal Graphics and Bear designs.
1 - 15" LED Lite tube, 3-12" and 1 - 9" Optix neon tubes and 7 small individual purple LED's
Kenwood KFC5708 5"x7" for rear, Kenwood head unit, (2) Kicker Comp 10", Pioneer GM-5100T 760W amp.
Edge Dagger 16" wheels. Chrome overlay stips for grill, brushed alum steering wheel spoke caps, and a purple LED undercar kit.
More coming soon!
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Posts: 102 | From: Nashville TN
| Registered: Mar 16, 2005, 7:45 PM
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gatoreye
Cruiser Buff
Posted: May 22, 2007, 12:13 PM
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Re: [Bears2005PT] Rim size question
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Rim size is irrelevant .......its to Diameter of the tire that one should consider.
Tire diameter affects your speedo......not rim size.
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Posts: 62 | From: kissimmee, florida
| Registered: Jan 11, 2007, 6:29 PM
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MICKEY41
Cruiser Addict
Posted: May 27, 2007, 3:34 AM
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Re: [gatoreye] Rim size question
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 This is for future reference if I ever get extra money or find a millionaire to marry me. Does anyone put bigger tires in the back? Does that look tacky to do that? Is it possible even? I have normal 15 inch tires. My son wants huge tires on it but he did that to his Samari and it rides so rough. He says to get big fat tires as well. I sort of like the idea of a bigger tire in the back so it looks even more like a roadster. advise? MICKEY
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2005 ELECTRIC BLUE CLASSIC
Being happy doesn't mean that everything is perfect.
It means that you have decided to look beyond the imperfections
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Posts: 884 | From: Gilbert, Arizona
| Registered: Apr 24, 2007, 8:45 AM
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gatoreye
Cruiser Buff
Posted: May 27, 2007, 2:50 PM
Post #10 of 13
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Re: [MICKEY41] Rim size question
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tires sizes that fit PT..............
PT Cruiser base and Dream Cruiser
195/65-15 25.0 ---- 5.5-7"
205/55-16 24.9 ---- 5.5-7.5"
225/50-16 24.9 ---- 6-8"
245/45-16 24.7 rear olny --- 7.5-9"
205/50-17 25.1 ---- 5.5-7.5"
215/50-17 25.5 ---- 6-7.5"
225/45-17 25.0 ---- 7-8.5"
235/45-17 25.3 ---- 7.5-9"
245/40-17 24.7 rear olny ---- 8-9.5"
245/45-17 25.7 rear olny ---- 7-9.5"
215/45-18 25.6 ---- 7-8"
225/40-18 25.1 ---- 7.5-9"
235/40-18 25.4 ---- 8-9.5"
245/35-18 24.7 ---- 8-9.5"
245/40-18 25.7 rear olny ---- 8-9.5"
235/35-19 25.5 --- 8-9.5"
245/35-19 25.7 rear olny ---- 8-9.5"
PT Cruiser Limited and Touring
205/55-16 24.9
225/50-16 24.9
245/45-16 24.7 rear olny
205/50-17 25.1
215/50-17 25.5
225/45-17 25.0
235/45-17 25.3
245/40-17 24.7 rear olny
245/45-17 25.7 rear olny
215/45-18 25.6
225/40-18 25.1
235/40-18 25.4
245/35-18 24.7
245/40-18 25.7 rear olny
235/35-19 25.5
245/35-19 25.7 rear olny
PT Cruiser GT
205/50-17 25.1
215/50-17 25.5
225/45-17 25.0
235/45-17 25.3
245/40-17 24.7 rear olny
245/45-17 25.7 rear olny
215/45-18 25.6
225/40-18 25.1
235/40-18 25.4
245/35-18 24.7
245/40-18 25.7 rear olny
235/35-19 25.5
245/35-19 25.7 rear olny
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Posts: 62 | From: kissimmee, florida
| Registered: Jan 11, 2007, 6:29 PM
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MICKEY41
Cruiser Addict
Posted: May 27, 2007, 7:51 PM
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Re: [gatoreye] Rim size question
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 THANKS GATOR EYE, I will add to my collection of need to knows for future reference. MICKEY
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2005 ELECTRIC BLUE CLASSIC
Being happy doesn't mean that everything is perfect.
It means that you have decided to look beyond the imperfections
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Posts: 884 | From: Gilbert, Arizona
| Registered: Apr 24, 2007, 8:45 AM
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gatoreye
Cruiser Buff
Posted: May 28, 2007, 2:43 PM
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Re: [MICKEY41] Rim size question
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you bet.....came from another PT site
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Posts: 62 | From: kissimmee, florida
| Registered: Jan 11, 2007, 6:29 PM
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silvereagle
Cruiser Addict
Posted: May 29, 2007, 10:09 AM
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Re: [gatoreye] Rim size question
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I have 235/40/18's on my 06 convertible. When I'm doing 60 I'm actually doing 61.3... or 17 turns less per mile.
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big jim
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Posts: 937 | From: New Castle ,Del, USA
| Registered: Aug 6, 2002, 12:00 AM
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