[ampeirce]

Hey all
How much butt can you cut ?
the frame is a 29er for a 140# 5'8" dude, It will be run rigid and suspended (465 AC)
Due to design changes from the time I ordered tubes ,the top tube got somewhat shorter and now the butts are gettin a little short. The tube in question is a TT VHT 31.8 8/5/8 and if I "split" the butts I only have 40mm+transition on each end, is this enough? the down tube is TT VHT 34.9 and has plenty of butt. the frame will be tiged. The rider is not super agro but our terrain is rough and it will be ridden very frequently. what do ya think?

 

[Walt]

You're fine.

If you've got at least 25mm of butt at each end (to the deepest part of the miter) on the toptube, you're good. 40mm is more than enough.

-Walt

Hey all
How much butt can you cut ?
the frame is a 29er for a 140# 5'8" dude, It will be run rigid and suspended (465 AC)
Due to design changes from the time I ordered tubes ,the top tube got somewhat shorter and now the butts are gettin a little short. The tube in question is a TT VHT 31.8 8/5/8 and if I "split" the butts I only have 40mm+transition on each end, is this enough? the down tube is TT VHT 34.9 and has plenty of butt. the frame will be tiged. The rider is not super agro but our terrain is rough and it will be ridden very frequently. what do ya think?

 

[pvd]

My happy place is to have about 25mm of butt in all but the DT/HT joint. I'm playing with longer butts there so I can use a gussett and smooth out some forces.

 

[ampeirce]

rule of thumb (butt)

So a basic rule of thumb is HAZ X 2 with exception to DT (I personally like to maximize the butt @ the HT /DT junction because I dont like gussets)
thanks all !