 What exactly IS offset, and how do I find it??, Buying Tenzo RS5s- need info on tires 2 |
 Jun 2, 2004 - 12:23 AM
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 Enthusiast  Joined Jan 8, '04 From LA Currently Offline Reputation: 0 (0%)  |
Ok, offset determines how far your tires stick out from the car. Right? good.
Whats the stock offset measurement on our cars? What does that mean? I'm getting Tenzo RS5s 17x7s- whats the offset? Does it even matter on the rim? or is it all in the tire size? and what tire size is right for our cars when upgrading to 17 inchers? Because I've heard that if you increase the wheel size, but don't decrease the tire size, things like your speedo will be off. Is the speedometer problem fixable? or is the only way to go with lower profile tires (and get much lower ride quality). Does upgrading to 17s and decreasing tire size even increase handling? or is it the same? As for offset recommendations- what do they mean and how do I implant them? I'd like to have the new rims to stick out from the car a LITTLE (I think it looks very rallyish and cool  but will that cause rubbing problems?And whats this about checking break clearance? Is that only needed when going the other direction (more IN to the car) is going out to less flush with the car a stupid idea? Feel free to tell me so. I did a search, but all I got was a lot of garbled results. A couple were decent. "Use this and this offset" but I still didn't UNDERSTAND the reasoning behind it. and whats this about a higher number offset being in closer towards the vehicle? So confused! Help!~!! |
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Jun 2, 2004 - 10:21 AM
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Enthusiast Joined Jan 17, '04 From Illinois Currently Offline Reputation: 0 (0%) |
The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. For our cars, offset is always a positive number. I have read that stock wheels on a GT have a 38 offset. However, this needs to be confirmed. I bought 17" wheels a few weeks ago with a 40 offset and I swear they stick out further than my stock wheels. Assuming a 38mm offset, the mounting surface is 38 mm further out toward the outside of the car than the centerline of the wheel. Increasing offset means the centerline is further out which, in effect, sucks the wheel into the car and closer to the suspension components. Using a lower offset does the opposite - it pushes the wheel out away from the suspension components. When you change wheel widths (to for example a 7.5" or 8" wheel), the offset numbers change. I suggest you use this website if you are changing the width of your wheels. wheel offset calculator
I have no idea. Call the vendor. A good one should know.
215/45/17 is what most of us with 17's are running. The 45 sidewall is better than something lower for purposes of ride comfort and protecting your rims from damage from a large pot hole. The tire is about 3% bigger in diameter than our stock wheels so your speedometer will be a little off. When the speedometer says 60, you will actually be traveling about 62. You can use this website to help pick out tire size to keep the speedometer deviation as close to zero as possible: Tire Size Calculator 205/45/17 are probably closest to stock size without sacraficing sidewall width but unfortunately there are not alot of tires out there in this size. 215/40/17 are also a good choice if you have very good roads in your area.
You can get new guages with a renumbered speedometer. Speedhut will custom make guages for this purpose. I checked into this when I was considering 225/45/17 because they are about 4.1% bigger. I was quoted a price of about $140 for reverse glow guages with the speedo markings moved and a 160 m.p.h. mark actually added to the guage. You also need to remember that changing overall tire size will also change your gear ratio which will affect performance. Hope it helps. - Jay This post has been edited by jgreening: Jun 2, 2004 - 10:38 AM -------------------- QUOTE(lagos @ Jul 10, 2006 - 1:55 PM) [snapback]454118[/snapback] i know your trying to do the right thing for your motor, but this is one of those times where you should just trust the guys who have had their swaps for a while and have done a ton of research into this. |
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Posts in this topic
shid What exactly IS offset, and how do I find it?? Jun 2, 2004 - 12:23 AM
shid Thank you so much jay!
changing overall tire ... Jun 2, 2004 - 10:53 AM jgreening QUOTE changing overall tire size will change gear ... Jun 2, 2004 - 11:22 AM ConeTrouble Upping you wheel and tire size will probably adver... Jun 2, 2004 - 11:48 AM Andason i have 215/35/18 and my speedo is the same Jun 2, 2004 - 12:06 PM shid Shawn, you're going faster than you think you ... Jun 2, 2004 - 1:54 PM jgreening QUOTE Will this also affect the odometer?
Yes. Jun 2, 2004 - 2:06 PM shid Nooooo
but it'll show as less miles than is ... Jun 2, 2004 - 2:40 PM turboinduction QUOTE (shid @ Jun 2, 2004 - 7:40 PM) Nooooo
but ... Jun 2, 2004 - 3:43 PM jgreening QUOTE but it'll show as less miles than is rea... Jun 2, 2004 - 4:57 PM shid Excellent Jun 2, 2004 - 6:20 PM Sheazy0219 Alright, so what if you were wanting to go with 18... Jun 5, 2004 - 2:21 PM shid Its like they said, the correct offset differs fro... Jun 5, 2004 - 2:35 PM KAMiX QUOTE Is the speedometer problem fixable?
Talk to... Jun 8, 2004 - 5:05 AM
mikeh117 Just remember that changing the rolling radius wil... Jun 8, 2004 - 9:26 AM |
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