Max, Your frame pictured appears to be a 60cm, which is measured center-BB to the top of the seat tube( C-T for short ).
The TT be measured center seat tube to center head tube ( C-C ). If measured along the top tube, regardless of angle, that's called the "actual TT". If the measured horizontally from the center-head tube horizontally to where it "would" meet the center seat tube(if it was that high), that's the effective TT( ETT ). The ETT is a virtual figure, it's "virtually" there but not actually ! Your TT ought to measure 63cm actual, 64cm effective. The effective can be a bit tricky, if you have a long straight edge with a level on it it's easy-er. For the canti wheel distance, just measure from the center dropout to the center canti post (where it meets the frame, not it's extension), along the seat stay. On the photo for example, you'd just draw a line along the chain stay between those two points, c-c. Any way you do it will work as long as you're consistent. By your photo I assume you are referring to the fitting of tires with the fenders installed ? If so, well it's not sized for that, the max tire size is for no fenders. You have to take in account the actual tire shape/type itself also, a Marathon Supreme is more like a slick tire. Knobbies need more room. Your Supreme with "room to spare" to you, doesn't appear to have any room to spare to me. I assume the fenders are P50's ? Fenders do need room for debris to pass. I have P50's and Big Ben's on my 60 Bomba and despite the tire being actually 46mm wide, it does rub very slightly against the mounting bracket rod inner hardware every so often when shaken hard. It's also a relatively tall tire, so that has to be accounted for also. So the clearance is just not vertical, it's also horizontal, the inner hardware, notably on SKS fenders. -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/298d9749-f7aa-4040-83b1-f53dff011512n%40googlegroups.com.
