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Old 11-21-2008, 07:51 AM   #1
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Default Cut rear tires for 4wd fronts

Anyone have a tutorial on how to do this? Ive run across several people saying it is easy but not found the way to do it yet. I have two sets of rears i would like to make one of them into fronts.
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Old 11-21-2008, 10:06 AM   #2
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I've not seen a tutorial, but I've done it successfully. The trick is to get the cuts straight so both remaining halves match up with little or no gap.

I cut a set of red ifmar pin rears since Losi doesn't make these in fronts. I took a regular heavy scissor and cut between the pins 1/3 of the way in from the right side, then again 1/3 of the way from the left, leaving a rubberband shaped piece from the middle of the tire as scrap. In hindsight I think it took a little too much out of the tire, nearly 1/4 inch (4 rows of pins) where maybe only 2-3 rows were needed.
I carefully glued both halves together with tire glue not regular CA, since tire glue remains flexible where regular CA gets stiff when it cures. I went around after the glue was set and put two extra layers of glue on the inside of the tire, widening the patch of glue slightly each time to make sure it fully covered any gaps. I let them cure overnight, then mounted them on the rims as usual after cutting the foams down slightly to match (optional).
These tires are worn now, but are still our go-to set for the SBV2 at any track.
I also reglued a set of Prolines that the foams had collapsed in (imagine that, crappy proline foam!) but the tires still had great tread left. Since the beads were glued solid I cut down the center of the tire to peel the halves back to get the foams out and new ones back in. This worked great since the line was exactly matching from left to right, but I couldn't get the extra glue on the backside once they were closed. Made a great set of practice tires.
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Old 11-21-2008, 11:21 AM   #3
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tutorial: http://www.4wdrc.com/tech/FrontTires.htm
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Old 11-21-2008, 11:41 AM   #4
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never heard of this before, but it's cool....I'd worry about the glue breaking under tire ballooning, bu I guess it's not a problem...
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Old 11-21-2008, 11:55 AM   #5
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Originally Posted by y2kgtp View Post
never heard of this before, but it's cool....I'd worry about the glue breaking under tire ballooning, bu I guess it's not a problem...
Nope, you can refoam a tire and glue it back together. it's common knowledge.
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Old 11-21-2008, 12:01 PM   #6
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Quote:
Originally Posted by RB FIVE View Post
Nope, you can refoam a tire and glue it back together. it's common knowledge.
I guess never running 4WD before.....I never had to deal with it....always been 2WD & Truck
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Old 11-21-2008, 12:07 PM   #7
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I actually made lots of 2wd fronts from 4wd fronts well before I made a 4wd front from a rear tire. Back before Losi made a taper pin 2wd front and that was the hot ticket at several of the major electric off-road races...
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Old 11-21-2008, 12:13 PM   #8
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....and I don't even like gluing tires to rims....
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Old 11-21-2008, 12:24 PM   #9
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I guess never running 4WD before.....I never had to deal with it....always been 2WD & Truck

It goes for all tires.

cut the inside sidewall and then reglue to change foam.
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Old 11-21-2008, 05:19 PM   #10
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There are a few R/C Car Action articles on this very subject. I wrote them . Check with them for a back issue.
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