On Tue, Aug 10, 2010 at 7:04 AM, Bob Cooper <robertcoo...@frontiernet.net> wrote: > The top tube should really be measured from a point in space that is > directly above the bottom bracket spindle to the center of the headset > lock nut and level with the lock nut.
I think that's an important measurement to know, as is the opposite - the setback from that point to the top of the seat post, but those are really just pieces of the overall reach measurement. If i understand Grant's post correctly, his approach puts the priority on proper saddle position first, and the TT length is simply whatever it needs to be to get the bars within the range of adjustability that bars and stem will cover. If you know your preferred reach and bar height, the bars you want to use and desired stem length, the TT length is naturally derived from the earlier decisions. This is a custom frame drawing, of course, which is why deciding the TT length ahead of time is meaningless. When shopping for an already-built frame, it IS important to know your reach, and be able to take those frame measurements to decide if it will be within the range of reasonable seatpost and stem adjustability to get the fit you want. I think what Grant is saying is that the TT number can't be looked at in an isolated way when ST angle, HT angle and bar height also affect reach. -- Bill Connell St. Paul, MN -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bu...@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
