yo TED!
Welcome!
As a buddy. Mike wrote elsewhere for his Bronco; "the tread on a 12.50 is almost 10" wide so they fit very well on a 10" wide wheel. With that you can run them at a higher PSI and have less rolling resistance, better gas milage and better handeling. When they are mounted on an 8" wheel the tread will have a slight bulge to it, and unless you run them at a lower pressure the tread will not wear evenly across the tire. You can lower the pressure but rolling resistance will go up."
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By SeattleBronco; "I like the wide track cosmetically and they perform well on rocks, sand and gravel. My experience is that dig in deep in snow and 8" wheels with a smaller tire track may perform better by riding on top."
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by Mike X "just upgraded to 15x10 and i had to take my bumper off to trim it"
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by Fireguy5010-19-2007, 12:13 AM
Yeah the tread on a 12.50 is almost exactally 10" wide so they fit very well on a 10" wide wheel. With that you can run them at a higher PSI and have less rolling resistance, better gas milage and better handeling. When they are mounted on an 8" wheel the tread will have a slight bulge to it, and unless you run them at a lower pressure the tread will not wear evenly across the tire. You can lower the pressure but rolling resistance will go up.
And this is how they wear. Notice how much more tread there is on the outer edges compared to the inside.
http://www.supermotors.net/getfile/479489/fullsize/100_2367.jpg
This is what I wanted to know. I want them to wear evenly and handle good.
I don't want 8in rims to make them wear like I have them over-inflated."
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Pics,
Here is one by Todd @
http://bronconine.com/v-web/gallery/albums/album55/DSC07571.jpg
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...but not for a Bronco... by Major S
33's on 15x8
http://www.supermotors.net/getfile/419491/fullsize/33on8.jpg
33's on 15x10
http://www.supermotors.net/getfile/462892/fullsize/img_0070.jpg
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And, depending on your Spring sag... you may need to use a cut-off wheel to trim the bumper or use washers to space it out further. On my 96, I had to space it out for 32 11.50's and trim that plastic valence a bit.
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We have some Sticky Tire Info Stickies here @
http://broncozone.com/topic/7590-tire-sizes/
Yep, 31x10.50's without any rub or fender contact. Try a search, there's plenty of info on tire size and fitment. I have 33x12.50R15's on 15x10" rims on my stock 86 Bronco with no rub, but each bronoc is unique, as are year models. Best suggestion is to try a 31/32/33" tire-rim combo on YOUR Bronco, and check the clearance. Do not forget the fact that a larger-than-stock tire will affect your final drive ratio, which affects mileage and the speedometer. You will want to know your axle gear ratio, as well as the engine/tranny/t-case model to figure the change from larger/taller tires. There are formulas to figure ear ratio for a tire size as well. by JSM84
&
http://broncozone.com/topic/6582-what-tires-you-can-run-with-what/
by ocalabronco
now, this is by no means the be-all, end-all bible for bronco tire fitment. there are all sorts of variables that come into play. This post is being created in order to cut down on the repetitive questions of what size tires can i fit with X amount of lift.
31" tires: these generally come on the truck stock. no fitment issues, no rubbing
33" tires: these WILL fit with no lift. the fit will be a touch snug, but you can either trim the edges of the bumper, or use washers as shims at the bumper mount. you can run a 3" body lift if you like to clear these tires, but its not necesary. slight rub will be encountered on the radius arms,depending on the dimensions of the rims
35" tires: these will fit with a 3" body lift at bare minimum, but its not advised for wheeling. large amounts of contact will be seen between body and tires. 4" suspension lift will provide better clearance, with a 6" suspension lift providing the optimal clearance while mainting a good center of gravity
38" tires: these can be run with 6" of lift and healthy amounts of fender trimming. its better to run around 8" of lift in order sufficiently clear these tires. once you get up into this size tire, you will be seriously taxing your stock running gear and drivetrain. a built up solid Dana 44 and rear 9" can handle this setup OK. adding a stonger rear, such as a Dana 60, is a safer option. depending on your typical wheeling enviroment, a swap to one ton running gear may be necesary to minimize breakage.
anything bigger than 38" is going to be totally custom, and you really should upgrade to one ton stuff
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Suggest you buy an OFFICIAL Ford Bronco Electrical and Vacuum Troubleshooting Manual (EVTM), Powertrain Controls and Emission Diagnosis Manual (PCED), Service Manual - Google for it - make sure it's by Ford and not by Chilton or some other source. Seabronc has a thread on this; hopefully he'll see this post and give you the keyword search he uses.
Here is the typical detailed info you'll get:
Electrical and Vacuum Troubleshooting Manual (EVTM) Partial, Bronco for 86; Speed Control, A/C, Heater, Radio
Source: by Ford via Chris B (Blue, bronco boy) at http://chrisb.users.superford.org/Bronco/Misc/
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Wiring Diagrams (Partial, Bronco similar) for F 150 in 86, 89, 91 & 95; EEC, Start/Ignition, EFI/Fuel System, Emissions, E4OD, AOD/C6 (+ clutch interlock switch), etc. from Electrical & Vacuum Troubleshooting Manual (EVTM)
Source: by Ford via Ryan M (Fireguy50) at http://fordfuelinjection.com/?p=36
Take a look @ all the other Stickies here too.. all @ top of sections and in;
http://broncozone.com/forum/20-how-to-tech-articles-reviews/
http://broncozone.com/forum/11-80-96-ford-bronco-tech-support/
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Also, Check out my broncolinks.com site for more info Links let me know how you like it or with suggestions.
You can use the Search Feature to the top, Right to find Links;
I just tried;
in an 86
and got 745 Search Results
6 Alternator 02/12/2008 @ 3:07:08
http://www.superford.org/registry/vehicles/detail.php?id=5183&s=22...
130 amp (3G) Installation Instructions, PA Performance, in an 86 by xris at SuperMotors.net...
Some will be repeated because a Link may apply to a few different sections;
and there will be more Links since some Links are described in year ranges, such as; from 81-86 or 86 to 91, etc.
One typical Result is;
3 Vacuum Tank & Vacuum Diagram, Ventilatio... 07/24/2009 @ 8:12:56
http://www.supermotors.net/clubs/superford/vehicles/registry/media...
Control Panel Diagram in
80-86 by Steve83 (Steve, That dirty old truck)...
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Auto Repair Reference Center Repair Manual, Mostly Chilton; many local library's offer free online access for their members; just log-in w/your library Card # and password; incl. all Broncos, & many MAKES! 1951 to 2009; some years (85-96, I believe) include: FULL Technical Service Bulletins and Recalls, Labor Hours per repair (plug in appl info); Wiring Diagrams, Vacuum Diagrams (in DRIVEABILITY AND EMISSIONS CONTROLS Section), Specifications (torques, etc.) & Maintenance Intervals
Source: by arrc.epnet.com
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Repair Guides & Wiring Diagrams (click vehicle, year range) & go to Chassis Electrical & scroll for Wiring Diagrams...(under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via Autozone
http://www.autozone.com/autozone/myzone/profile/membershipBenefits.jsp?intcmp=sz_1&myZoneLanding=myZone
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