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Old 11-12-2006, 05:09 AM   #1
StephenB OP
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Airhead GS tire width measurements

Building/Mod'ing a Airhead Monoshock GS (http://www.stephenbottcher.net/BMW/R100ST.htm). Need to re-lace the rear wheel and am trying to understand how far I should go with lacing offcenter to get the tire clear of the swingarm and what the different tire models/brands do to the width. How much width variation is attributable to tire pressure reduction you think?

E.g. 140/80-18 Bridgestone BT45V 5.5" max width @ 26" dia. (R100R example)

I would need width measurements of knobby tires (e.g. TKC80, D908RR) and street tires (e.g. Anakee, Tourance). I guess some of you guys run 140/80-17 and 130/80-17. Also, I need to know the diameter where the largest width occurs.

Not really a science project but I need a lot of values of different tire sizes and models as I don't wanna get caught after it is all laced up. So just head over to the shed with a tape measure, will ya !

Would appreciate all your inputs.

Stephen
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Old 11-12-2006, 08:45 AM   #2
camgregus
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Avon Gripster am24 130-17 5 5/8"

It seems the same width at all points in the diameter?
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Old 11-13-2006, 05:18 AM   #3
Motomech
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Anakee 130/80-17
130m/m = 5 1/8"

I've recently moved a couple of rims over and here's my advice(as applies to the Paralever).
WD40 the nipples and let them soak.
Go around the inside(swingarm side) and loosen all spokes a half a turn, then go around the outside and tighten a half a turn. Repete til you move it the rim the required distance. These rims are really stout and to go a couple of m/m's, you need not worry about the rim getting out-of-round.
Check by laying a straight edge across the rim and check the depth to the hub.
Trying to go more then several m/m's, will have the inside of the nipples bottoming out on the end of the spoke and will require removing the nipples to drill/break-out the inside portion. But you shouldn't need to go this far and shouldn't be a issue.
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Old 11-13-2006, 05:27 AM   #4
datchew
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I think he means if you look at the tire from the back (skinny view) how far from the center of the wheel is the thickest part of the tire.

I'll get you the tourances...
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Old 11-13-2006, 05:42 AM   #5
datchew
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Location: Savannah - the dirty south
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metzler tourance: 130 80R/17

Width = 13cm at thickest point being 28cm from center of hub.

*edit*
ps. Someone recently addressed the spacer issue for running the tkc 80's.
I think it was Solo Lobo and they gave the proper bmw part number for the spacer and everything.
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Old 11-13-2006, 07:07 AM   #6
Gezerbike
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While I didn't got out and measure, when I put the Gripsters on the GS they are /were within an 1/8 " of the swingarm and have rubbed it on occassion, probably when I have lowered the air pressure in the tire. No problem since I now know to keep the pressure up.
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