Lug Wrench

[Roebling3]

I'm so lucky I stopped carrying tools nearly 40 years ago.  Good fortune,  R3~

[Matt Story]

= (27/2) * [2/sqrt(3)] = 27/sqrt(3)

The general rule, then, is hex size = sqrt(3) times flat length.

or,

(side length * sin 60deg (.866...))*2=hex size  then round slightly for measuring errors and fastener tolerances

[charlie b]

Or, you can get the ones that have an axle wrench on one end and a tire spoon on the other.

But, every now and then I like to make my own tools too.  Like my custom tool for removing FAC cartridges.

[Kiwi_Roy]

I really admire the innovative improvisation of the Original Poster. I am not raining on his parade. However, similar already-made motorcycle wrenches are out there for those who don't want to cope with a coping saw:

http://www.ebay.com/itm/RK-Closed-End-27-mm-Wrench-for-Motorcycle-Tool-/192011133290?hash=item2cb4c1616a:g:VrIAAOSw8w1X3btV&vxp=mtr

Nice but not as pretty as the Guzzi dog bone

[Waltr]

This ^^ The original Guzzi "dog bone" wrench is what I carry.

This thread was beginning to make my head hurt (not that hard to do lately) ,   THANKS CHARLIE!

[sturgeon]

I really admire the innovative improvisation of the Original Poster. I am not raining on his parade. However, similar already-made motorcycle wrenches are out there for those who don't want to cope with a coping saw:

http://www.ebay.com/itm/RK-Closed-End-27-mm-Wrench-for-Motorcycle-Tool-/192011133290?hash=item2cb4c1616a:g:VrIAAOSw8w1X3btV&vxp=mtr

To add to the parade deluge, 22/27 are fairly common size pairs for dual-sport/dirt bike axles, and doubled-ended box wrenches in those sizes can be found in lots of places. I'm kinda partial to the tire-iron/axle wrench combos myself.

[Moto]

or,

(side length * sin 60deg (.866...))*2=hex size  then round slightly for measuring errors and fastener tolerances

That's the same as multiplying by the square root of 3, a number that I have memorized. If you can remember the sine of 60 degrees and multiply it by 2, that's just as good.

Moto

[malik]

http://www.bestrestproducts.com/p-329-besthex-27-mm.aspx

For road trips these besthex wrenches work well - especially for those of who, although intrigued by the problem, are not really competent to do anything effective ourselves.

Mal

[sib]

Sorry, but this seems like the right occasion to bring in Ichiban Moto.

https://www.youtube.com/channel/UC28gtkJP-bK77M5Qyc3Dn7g

[charlie b]

That one is actually just a photo from eBay. Mine looks even better - bought it as part of a bunch of replated stuff from Mark Etheridge, so it looks new.

charlie b: since your's is for the T5, shouldn't it be 22 mm on one end and 24 mm on the other?

Charlie,  you are correct again!!  I just looked and mine is 22 and 24.

[Tom]

I use/carry an adjustable crescent wrench that fits or the dogbone.  Depends on the bike and where I'm riding.