Berry Posted December 13, 2014 Posted December 13, 2014 I bought a frame with isp but not sure how to cut the post. I measured my old frame but if I use the same measurements it's way to high.
JA-Q001 Posted December 13, 2014 Posted December 13, 2014 Ok, take your old bike/build and measure your seat hight from the pedal to the seat rail, this is assuming you are using your old seat on the new bike If you are going to use a new seat, then measure to the top of the seat. Now build the new bike, clamp the seat in the topper and mount it on the post. Now again measure from pedal to seat rail or seat top. Subtract the new bike length from you actual hight and that will give you the amount to cut off. Ask if something is not clear.
Berry Posted December 13, 2014 Author Posted December 13, 2014 Ok, take your old bike/build and measure your seat hight from the pedal to the seat rail, this is assuming you are using your old seat on the new bike If you are going to use a new seat, then measure to the top of the seat.Now build the new bike, clamp the seat in the topper and mount it on the post. Now again measure from pedal to seat rail or seat top. Subtract the new bike length from you actual hight and that will give you the amount to cut off.Ask if something is not clear. That's what I did but it feels like the saddle is way to high.
Berry Posted December 13, 2014 Author Posted December 13, 2014 I moved the saddle forward but not feeling comfortable I need to point my toe to ride
JA-Q001 Posted December 13, 2014 Posted December 13, 2014 Is your stack hight still the same? If your hb is significantly lower, then it can feel like that as well.
Berry Posted December 13, 2014 Author Posted December 13, 2014 Same crank but what I see is that the angle of the seatpost is not the same
Hairy Posted December 14, 2014 Posted December 14, 2014 Rather to tall to start with and you then incrementally reducing the isp vs the isp bring cut too short the first time
eddy Posted December 14, 2014 Posted December 14, 2014 Keep taking it down in increments of 2 cm at a time and when it feels too low,raise it a bit....... Seriously, as seat tube angles differ and errors are expensive to fix, see a professional to do it for you.
Berry Posted December 14, 2014 Author Posted December 14, 2014 Thanks guys I eventually got it sorted cutting 5mm at a time.
Guest DieBees Posted December 14, 2014 Posted December 14, 2014 Flip. I am happy you got it right. I know someone who cut his' too short by about 5cm... He had to sell it.
pista Posted December 14, 2014 Posted December 14, 2014 Flip. I am happy you got it right. I know someone who cut his' too short by about 5cm... He had to sell it. 5cm is a huge mistake but often seen them cut to short. Measure twice,then cut once.
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