tiermat":12803ipx said:
I would say as long as the seat post goes past the top tube/seat stay joint by a good 20mm or so you should be ok.
Any less will be putting too much strain on the unsupported tubing, leading to cracking and failure.
I would suggest you fit a seat pillar that reaches at least 1 inch past the toptube / seatstay joint ASAP, as even if it doesn`t crack the seat tube up stand it will most likely bend it
