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#1 |
Registered User
![]() Join Date: Jul 2014
Location: Sherwood, Oregon
Posts: 974
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Tire and Wheel Combo Question
I am looking at some 18x9 eight lug wheels for my BABA YAGA! project.
I am looking to run 245/45/18's in the front (9.6" tread width) and 285/45/18's in the back (11.2" tread width). Am I going to have trouble running the 285/45's on a 9" rim in the back? I know the 245/45's in the front will be fine.
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--Project BABA YAGA!... http://67-72chevytrucks.com/vboard/s...d.php?t=655783 --Project BABA YAGA!... http://67-72chevytrucks.com/vboard/s...ghlight=Belair "Life is tough - wear a cup!" "Old Enough to Know Better - Too Young to Resist" "Junk is something you will need three weeks after you throw it away." |
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#2 |
Registered User
![]() Join Date: Jul 2014
Location: Sherwood, Oregon
Posts: 974
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Re: Tire and Wheel Combo Question
No Opinions?
Okay, how about this question in conjunction with the previous one: How much static drop can I expect on a C20 axle flip? (with/without removing the overloads) I am going to install a 2.5"-3" drop spindle setup and I am trying to determine if I need 1" drop springs after the static flip. Here is how I am calculating my static rear drop: 1. Leaf pack is 3.375" tall 2. Axle diameter is 3.375" (A) Move axle to the top of the leaf pack nets a 3.375" drop (B) Add the radius of the axle tube (1.6875) to the leaf pack for a 5.4375" total drop. With a 3" C30 drop spindle, I would end up with a 3/5.5 combo....? Am I calculating it right? Will I most likely be level, a slight front rake or dragging my tail? I don't want a lot of front rake nor do I want to motor boat the rear end. I need to make a decision on the flip/front static drop needs, before installing the transmission, so I can get the pinion angle set at the same time. The trans is going in mid-week next week, so I have a very small window of time and would like to order parts ASAP as needed. Thanks!
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--Project BABA YAGA!... http://67-72chevytrucks.com/vboard/s...d.php?t=655783 --Project BABA YAGA!... http://67-72chevytrucks.com/vboard/s...ghlight=Belair "Life is tough - wear a cup!" "Old Enough to Know Better - Too Young to Resist" "Junk is something you will need three weeks after you throw it away." |
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#3 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: Tire and Wheel Combo Question
Your math is correct for the rear. I would guess about 6" rear drop @ least.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#4 | |
Registered User
![]() Join Date: Jul 2014
Location: Sherwood, Oregon
Posts: 974
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Re: Tire and Wheel Combo Question
Quote:
Thanks for the reply. So, it looks like I would need a C-Notch if I am approaching the 6" threshold, correct? With the C30 3" drop spindles, do you think I will be motor boating the rear? Will I need additional help in the front, like drop springs... 1", 2"? Lastly, I was hoping to stay in the 4-5" range and avoid a frame notch. if I want to stay in the 4" rear drop area, are there other alternatives that will work, other than an axle flip, that will keep it level or a slight front rake... given my wheel and tire combo? Thanks!
__________________
--Project BABA YAGA!... http://67-72chevytrucks.com/vboard/s...d.php?t=655783 --Project BABA YAGA!... http://67-72chevytrucks.com/vboard/s...ghlight=Belair "Life is tough - wear a cup!" "Old Enough to Know Better - Too Young to Resist" "Junk is something you will need three weeks after you throw it away." |
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#5 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: Tire and Wheel Combo Question
4" rear drop would be shackle & hanger combo (2" drop each). 6" rear drop on leaf trucks can get by w/o a notch (approx. 2" of travel) but your better off w/more clearance. The factory bump-stops will make contact & will need to be removed and/or replaced w/something shorter.
I do think you'll need to go w/shorter springs in the front in addition to the spindles if targeting the 6" rear drop.
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#6 | |
Registered User
![]() Join Date: Jul 2014
Location: Sherwood, Oregon
Posts: 974
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Re: Tire and Wheel Combo Question
Quote:
Thanks. I might start with the flip and spindles initially, to see just how radical the rake is and adjust with springs accordingly. I will have the body and paint guy box in a small c-notch, as I don't foresee needing the Full Monte from the after market kits. On the drop springs, what do you think I might need in conjunction with my wheel/tire setup above and 3" spindles... 1" or 2"? Some rake is fine, just want to avoid the 70's Hijacker Air Shock look ![]() I appreciate it! Now I have some working numbers so I can order parts.
__________________
--Project BABA YAGA!... http://67-72chevytrucks.com/vboard/s...d.php?t=655783 --Project BABA YAGA!... http://67-72chevytrucks.com/vboard/s...ghlight=Belair "Life is tough - wear a cup!" "Old Enough to Know Better - Too Young to Resist" "Junk is something you will need three weeks after you throw it away." |
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#7 |
Registered User
Join Date: Sep 2010
Location: Lake Tahoe, Nevada
Posts: 755
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Re: Tire and Wheel Combo Question
Wait, back to the original question. Are you SURE a 245/45/18 will fit on a 18x9 rim? A 9.6" width on a 9 inch rim?
I'll be honest, I haven't dealt with low-profile tires much, but I know that a standard 33x12.5R15 will NOT fit on a 12" rim, the manufacturer specifies 8-10" width. Unless low-profile tires work radically different, I think your front tires are too narrow (or your wheels are too wide).
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I know a little about cars, but if you have a question about electricity or sport quads, I'm your man!!! |
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#8 | |
Registered User
![]() Join Date: Jul 2014
Location: Sherwood, Oregon
Posts: 974
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Re: Tire and Wheel Combo Question
Quote:
Nice catch. I checked online and the recommended tire is a 295/65 (33"... almost 2" taller than what I have now) yielding an 11.6 width. I think I can squeeze in a 305 @ 12" but will most likely have rubbing issues, so the 285-295 rear tire will probably find their way on the back. The fronts could go 255-265 bumping the width to 10.4... I will verify with my wheel and tire people tomorrow before heading North to meet with the body and paint people to finalize our dates. Maybe I can cajole them into a test fit to see how it looks and fits. It might even influence my flip and spindle purchase...
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--Project BABA YAGA!... http://67-72chevytrucks.com/vboard/s...d.php?t=655783 --Project BABA YAGA!... http://67-72chevytrucks.com/vboard/s...ghlight=Belair "Life is tough - wear a cup!" "Old Enough to Know Better - Too Young to Resist" "Junk is something you will need three weeks after you throw it away." |
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#9 |
Registered User
Join Date: Sep 2010
Location: Lake Tahoe, Nevada
Posts: 755
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Re: Tire and Wheel Combo Question
Actually, I just looked up the specs on some general 245/45/18 and 285/45/18 tires. I think you're good on both counts, the 245 had a recommended rim width of 7.5-9", and the 285 had a recomended width of 9-10.5", so I think you're at the minimum and maximum of each.
I'd still verify with your tire people, though.
__________________
I know a little about cars, but if you have a question about electricity or sport quads, I'm your man!!! |
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