The one from the rear master cylinder to the rearset assembly. Part 17 in this image. I know there's a way to tell diameters from the part number.. so I'm thinking the 8 in the part number (732806-001) would mean that it's an 8mm ID hose.. but don't remember for sure.

Thanks guys.

Bump?

Ever get an answer???  I'm gonna bleed mine tommorow ( feels mushy but pads are good )  I can just pull it off and whip out the caliper

nope, no answer yet. I was wishing I had my digital calipers so I could check for myself.

do you just measure the entire width of the hose? i took my digital calipers out there right now.. got readings around 14mm. dunno if thats right though... or helpful. heh

I'm looking more for ID than OD

Yup....I'll probably get out there about 1 gotta finish up some crap inside first   I'll post what I find before I go to work

If I remember I will check tonight. Plenty of hoses off bikes.

8mm ID is correct

ohh....*ID*... duh. sorry

Sweet.. I'm no longer a GS retard.. I pulled 8mm from the part number!

Thanks dgyver... I really gotta ride out and hang out with you someday.. I can't imagine the cool stuff I could find in your garage... got any spare front ends laying around?