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    Thread: Offset vs Backspacing conversion chart and other wheel measurement info

    1. n00b dcline's Avatar
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      00 jetta 1.8t
      05-28-2010 05:28 PM #51
      can you fit 19x9.5 in the back of a mkIV jetta without any clearance issues or mods to the fenders? and anyone know what offset if you can? the car is lowered 1.75"

    2. 05-31-2010 11:15 PM #52
      17x8 ET48 Audi A8 Fat Fives on a B5 Passat sedan 1.8t Lowered 1".......Will they fit help please!!

    3. Member JDriver1.8t's Avatar
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      06-01-2010 05:32 PM #53
      Quote Originally Posted by dcline View Post
      can you fit 19x9.5 in the back of a mkIV jetta without any clearance issues or mods to the fenders? and anyone know what offset if you can? the car is lowered 1.75"
      They can fit without problems. For flush fitment, you want the offset around 40mm, and for some poke, down to 30mm or lower. A 265/30/19 would be vertical sidewalls, a 245-55/30/19 would be slight stretch, a 235-225/35/19 would be moderate stretch.


      Quote Originally Posted by bettaberettaboy View Post
      17x8 ET48 Audi A8 Fat Fives on a B5 Passat sedan 1.8t Lowered 1".......Will they fit help please!!
      What is the stock specs on your wheels? I'm pretty sure they will fit without problems though. You may just need spacers.

    4. 06-01-2010 08:22 PM #54
      I have a 08 2.5 Jetta and I'm running fk coils I bought Mercedes wheels and they are staggered 18x8.5 and 18x9.5 with et43 I can't figure out what tire size to run I know that most ppl run 215 40 and 225 40 but I would like more tire just because it seems safer. What is the widest tire I can fit? Or would I just be better off running 225s and 215s any info helps thanks

    5. Member JDriver1.8t's Avatar
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      06-03-2010 09:42 AM #55
      Quote Originally Posted by rubbermydubber View Post
      I have a 08 2.5 Jetta and I'm running fk coils I bought Mercedes wheels and they are staggered 18x8.5 and 18x9.5 with et43 I can't figure out what tire size to run I know that most ppl run 215 40 and 225 40 but I would like more tire just because it seems safer. What is the widest tire I can fit? Or would I just be better off running 225s and 215s any info helps thanks
      I would recommend a 225/40 front and a 255/35 rear, but I'm not sure how much space you have out back. That is minimal stretch. A 245 in the rear would also work.
      If it does rub, the simple solution is just to raise your coils some.

    6. 06-03-2010 10:36 AM #56
      Quote Originally Posted by JDriver1.8t View Post
      I would recommend a 225/40 front and a 255/35 rear, but I'm not sure how much space you have out back. That is minimal stretch. A 245 in the rear would also work.
      If it does rub, the simple solution is just to raise your coils some.
      good deal man you think i can run 225 35 and 245 35? found a yokohama s drive set up for a decent price i do a lot of driving so i think the right size tire is a must...

    7. Member JDriver1.8t's Avatar
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      06-03-2010 10:50 AM #57
      That would make your front tire a lot shorter. You want to keep close to the same outer diameter. That is why you would run a 225/40 and a 245/35. The second number is the ratio of height to width in a percentage; ie 40% of 225 and 35% of 245 for the sidewall.

    8. 06-03-2010 11:03 AM #58
      Got ya so 225 40 and 245 35 would have the same height in the side wall
      It will look even?

    9. Member JDriver1.8t's Avatar
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      06-03-2010 12:33 PM #59
      technically a 255/35 and 225/40 do, but if may run into rubbing problems then a 245/35 is an ok substitute. They will look even. There is only a 1.3% difference in their rolling diameter, and a .17'' difference in sidewall height.

    10. 06-03-2010 04:20 PM #60
      Thanks a lot dude you've been a huge help. One more question is a 225a stretch at a am I going to be able to go low? Would I be better off running a 215 with a 245? Any chance u know anything about lug nuts lol

    11. Member JDriver1.8t's Avatar
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      06-15-2010 06:58 PM #61
      There is very little about wheels, tires, and suspension that I don't know about.
      I'm familiar with lug nuts of many kinds.

      225 on a 8.5 is mild stretch (and it depends on the tire as well).
      Here is a Bridgestone Potenza 225/40/18 on a 8.5''


      Going low is a game of offsets as much as it is tire widths. I really consider people who stretch tires and use smaller tire sizes as cheaters.

      Here is how my car sits with 225/40/18 on 8.5 et27f and et23r (and bags)

      Last edited by JDriver1.8t; 06-15-2010 at 07:00 PM.

    12. 06-15-2010 08:04 PM #62
      sent pm btw ur car is sick

    13. 06-16-2010 08:17 PM #63
      Hey, haven't been on in awhile but had a quick question but first let me set it up: as i mentioned in previous posts, I came into a set of wheels that had an offset of +48mm. I went ahead and ordered 17.5mm spacers and 14x1.5x45.5mm conical lug bolts. Turns out the wheel holes are too small. The cone shape of the lug bolts won't allow them to sit right. They won't go in all the way.

      As I've read in previous posts/threads, my problem has come up with other members.

      I was hoping you'd have some insight as to where i might find tuner lug bolts that would solve my dilema? I have found 40mm tuner lug bolts but that's obviously 5.5mm shy of what i was looking for. Would it be unsafe to run them? Thanks

    14. Member
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      06-17-2010 06:43 PM #64
      Hello all,

      I have a 2008 Eos with stock 16 inch rims and tires. I am interested in a set of OEM 17" by 7" wide rims with 235/55/17 tires off a Tiguan that has an offset of ET43. In researching my rims, they are 16 by 7 with an offset of 45. Is a 2 (mm?) offset an issue? I know the speedo will be off (and I can VAGCOM it) but that is not an issue. And it appears that both rims have a 57.1 mm center bore so that should also fit. I just don't have enough knowledge of how the offset factors in, other than if it is off, the tires may run against the inner fender or the suspension...

      And what if the rim width was 7.5 inches? What offset would I need to not have to use spaces or whatever -- just a clean bolt on and go rim?

      Thanks for the help!

      Frank

    15. Member JDriver1.8t's Avatar
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      06-18-2010 11:58 AM #65
      Quote Originally Posted by xxswat718xx View Post
      Hey, haven't been on in awhile but had a quick question but first let me set it up: as i mentioned in previous posts, I came into a set of wheels that had an offset of +48mm. I went ahead and ordered 17.5mm spacers and 14x1.5x45.5mm conical lug bolts. Turns out the wheel holes are too small. The cone shape of the lug bolts won't allow them to sit right. They won't go in all the way.

      As I've read in previous posts/threads, my problem has come up with other members.

      I was hoping you'd have some insight as to where i might find tuner lug bolts that would solve my dilema? I have found 40mm tuner lug bolts but that's obviously 5.5mm shy of what i was looking for. Would it be unsafe to run them? Thanks
      I would recommend going longer instead of shorter. I have seen 45mm tuner bolts on ebay occasionally and that is what I would look for. You can also get 50mm bolts, and try them. If they cause problems, then use a hack saw to cut off a few mm.

    16. Member JDriver1.8t's Avatar
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      06-18-2010 12:01 PM #66
      Quote Originally Posted by FMinMI View Post
      Hello all,

      I have a 2008 Eos with stock 16 inch rims and tires. I am interested in a set of OEM 17" by 7" wide rims with 235/55/17 tires off a Tiguan that has an offset of ET43. In researching my rims, they are 16 by 7 with an offset of 45. Is a 2 (mm?) offset an issue? I know the speedo will be off (and I can VAGCOM it) but that is not an issue. And it appears that both rims have a 57.1 mm center bore so that should also fit. I just don't have enough knowledge of how the offset factors in, other than if it is off, the tires may run against the inner fender or the suspension...

      And what if the rim width was 7.5 inches? What offset would I need to not have to use spaces or whatever -- just a clean bolt on and go rim?

      Thanks for the help!

      Frank
      I would recommend getting the proper sized tires. There is a good chance those could rub with that tall of a tire. The wheels would bolt on with no problems though. THey would sit out 2mm farther than your current setup. If you went to a 7.5'' width and kept the et43, then they would sit ~6mm farther out and 4mm more inboard.

    17. n00b
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      1999 VW Lupo 1.4s 16v
      06-18-2010 02:26 PM #67
      hi , i have been using the site for a few days now and already got loads of help scanning the pages of the forum. I have now joined and am seeking just a little bit more info if someone doesn't mind. My Mrs has just picked up a peach of a Lupo, or i should probably say a lemon due to its striking yellow.
      It currently sits on 13" factory fitted steels. At some point i would like treat her and get some alloys fitted. Without going though any issues of lowering/stiffening or modifying at all can anybody tell me which size rims and tyres i should look for, the only info i got so far was not to exceed a 14" rim otherwise she may need to get stiffer coils/suspension. Thanks for reading.

    18. 06-18-2010 10:04 PM #68
      this is my new wheels
      18x8.5 front et44
      18x9.5 rear et44
      my front fenders are rolled. an have fk coils

      going from 5x100 to 5x112 what size adapters for the front? looking to be as flush possible don't mind a lil poke if i can't get flush. thinking 16mm adapters up front they told me thats the smallest they make.
      rear 18-20mm adapters is what i was thinking
      tires thinking
      205/40/18 front
      215/40/18 rear
      what do u say i should do to make them fit.. more confuse about how will they fit on the front..
      THANX

    19. Member JDriver1.8t's Avatar
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      06-19-2010 04:31 PM #69
      Quote Originally Posted by Getcheeky View Post
      It currently sits on 13" factory fitted steels. At some point i would like treat her and get some alloys fitted. Without going though any issues of lowering/stiffening or modifying at all can anybody tell me which size rims and tyres i should look for, the only info i got so far was not to exceed a 14" rim otherwise she may need to get stiffer coils/suspension. Thanks for reading.
      Sorry, but I don't have any knowledge on this vehicle. You may see if there is a vehicle specific sub-forum that may be of more help.

    20. Member JDriver1.8t's Avatar
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      06-19-2010 04:33 PM #70
      Quote Originally Posted by Rays_2001gti View Post
      this is my new wheels
      18x8.5 front et44
      18x9.5 rear et44
      my front fenders are rolled. an have fk coils

      going from 5x100 to 5x112 what size adapters for the front? looking to be as flush possible don't mind a lil poke if i can't get flush. thinking 16mm adapters up front they told me thats the smallest they make.
      rear 18-20mm adapters is what i was thinking
      tires thinking
      205/40/18 front
      215/40/18 rear
      what do u say i should do to make them fit.. more confuse about how will they fit on the front..
      THANX
      How low are you? The lower you are, the more the front wheels pull in, and the lower the offset you need to be flush. For a 1 finger gap, you would want to run 16mm front adapters for a final et of 28mm on a 8.5.
      In the rear, I would stick to 18 or 20mm as well. You will be flush, to slight poke possibly. I would run a 215 in front and a 235 in the rear for mild stretch. If you go with a 205 in front, then use a 225 in the rear to keep the stretch near the same front and rear.

    21. Member
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      06-19-2010 10:21 PM #71
      Quote Originally Posted by JDriver1.8t View Post
      I would recommend getting the proper sized tires. There is a good chance those could rub with that tall of a tire. The wheels would bolt on with no problems though. THey would sit out 2mm farther than your current setup. If you went to a 7.5'' width and kept the et43, then they would sit ~6mm farther out and 4mm more inboard.
      Hi. Thanks for the comments. Using the Miata tire size calculator I see where you are coming from -- my current 215/55 16 combo has a diameter of 25.3 inches and these would be 27.2 inches so about 1 inch higher radius-wise. The offset does not sound like an issue. Guess I should do some measuring -- I guess the big issue would be the front tires when turning and hitting a bump in the road. They might hit the fender...

      Frank

    22. n00b
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      1999 VW Lupo 1.4s 16v
      06-20-2010 05:37 AM #72
      Quote Originally Posted by JDriver1.8t View Post
      Sorry, but I don't have any knowledge on this vehicle. You may see if there is a vehicle specific sub-forum that may be of more help.
      I see I have posted in the wrong thread, sorry. I have found a Lupo thread, thanx anyhoo

    23. Member CamaroSS's Avatar
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      06-22-2010 07:39 PM #73
      I have a set of ADR Cyphers that are 18x7.5 with a 48mm offset. what size spacers will i need to get these to a stock stance? and what size spacer would i need to sit flush with the fenders?

    24. Member Usualsuspekt's Avatar
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      98 VR (The Deer Whisperer)
      06-25-2010 01:44 AM #74
      To late to call around and it would seem that you would be the person who knows whats up with wheel fitment. I have a MKIII with the standard 15x6.5 ET43 'Bugs and I will be running a 195/50-15 Bridgestone RE-11's. My question is I would like these guys to fit pretty flush and am in need of the correct size spacer to run to achieve this. Thanks for your help

      Your MKIV is the portrait of wheel and tire fitment perfection by the way!

    25. Member JDriver1.8t's Avatar
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      06-27-2010 10:12 PM #75
      Quote Originally Posted by CamaroSS View Post
      I have a set of ADR Cyphers that are 18x7.5 with a 48mm offset. what size spacers will i need to get these to a stock stance? and what size spacer would i need to sit flush with the fenders?
      I'm assuming that this is for the '01 in your sig.......
      I can't get you flush without knowing how low you are, but I can get you close.....
      Because they are so narrow, true flush would be had with 30mm front and 40mm rear spacers. I don't recommend going over 25mm without getting the bolt on variety, that bolt to the hub, and then you bolt the wheel to the spacers. Your wheels would still look decent with 20mm front spacers and 25mm rear spacers.

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