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Cutting Tyre Foams

Guide by TWiNSET

Without foams at all, they're a bit too 'mushy' and uncut foams just don't look good Wink

Plus, cut foams are a bit like running tyres on low air pressure - it gives a slightly bigger contact patch, and the tyre deforms easily around the terrain.

So, just got a new set of Moabs off eBay..........................



With new foam in, the tyre is really packed out - notice the convex shape of the sidewalls where the foam is too big for the carcass, so pushing the walls out;





 
Get a knife with a long sharp blade, at least the width of the foams



Eventually, I cut about 1/4'' off each side, but to start with, just take it off one side (to leave a flat face for the next step)




The Marking;

Start by dividing the circle into quarters



Then, eighths (that's 45 degrees)




Ok, now take a line from the top of one line to the bottom of the next (this'll create another marking point)



Take a line from that intersection, across the centre hole, to it's opposing intersection



Then, take a line from the top of the new one, to the bottom of each line either side



Ok, the less boring bit - cut from the outside into the V created by all those lines, being careful not to cut past the bottom of the V, leaving this;

[img]http://img255.imageshack.us/my.php?image=f10dn1.jpg[/img]

With scissors, cut a small bit of each corner off, to give the tyres a more rounded profile (if that's what you want)





Almost done!

Turn foam inside out



Cut a small 45 degree chamfer around the edges (to allow foam to seat inside the beads better - a 5mm x 5mm chamfer is good for starters

Also, if you didn't already, shave the face with all the pen lines on it (the other 1/4'' from earlier)





Finally, turn it back the right way (points to the outside),put it back in the tyre and admire the concave profile of the tyre Very Happy


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