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Shave seat tube???

Posted: Nov 20 2020 7:24pm
by JeffnAZ
I'm getting a bike ready for a E build and one of my goals is to get the seat as low as possible. I'm thinking about cutting a little off the top of the seat tube to achieve this. Anyone try this???

Couple pics... was thinking shave just about a quarter inch (6mm) off the top. It should still clamp without cracking anything i think.
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Thanks for any wisdom.

Re: Shave seat tube???

Posted: Nov 20 2020 8:51pm
by efMX Trials Electric Freeride
I did this with no regrets (so far)..
in my case used a bit larger frame for more battery space and a lower seat to bar height (than I would for a pedal only bike)..

Re: Shave seat tube???

Posted: Nov 20 2020 9:45pm
by spinningmagnets
I did that years ago, and no cracks have formed. Seat tube still works fine.

Re: Shave seat tube???

Posted: Nov 21 2020 5:17am
by JeffnAZ
Lol... thanks folks. Thought for sure this idea was going to be criticized. But no. I’m not the only person to think of cutting down a seat tube for a fraction of an inch of adjustment. Awesome.

Re: Shave seat tube???

Posted: Nov 21 2020 5:23am
by JeffnAZ
spinningmagnets wrote:
Nov 20 2020 9:45pm
I did that years ago, and no cracks have formed. Seat tube still works fine.
Thanks! Did you happen to extend or modify the split on the back of the seat tube that allows the tube to clamp down?

Re: Shave seat tube???

Posted: Nov 21 2020 7:53am
by spinningmagnets
I wanted the seat as low as possible.
Slide the clamp down as low as it would go to mark a half-inch above it.
Remove the clamp
Slide an automotive hose-clamp onto the tube (to where the seat clamp was) to act as a guide for the hacksaw.
Cut the tube at the mark
Cut a slice down the back (angle grinder with a thin blade or Dremel), and it's done.

Re: Shave seat tube???

Posted: Nov 21 2020 10:56am
by JeffnAZ
spinningmagnets wrote:
Nov 21 2020 7:53am
I wanted the seat as low as possible...
Thanks, man. Enjoy your weekend!

Re: Shave seat tube???

Posted: Nov 22 2020 11:51am
by JeffnAZ
spinningmagnets wrote:
Nov 21 2020 7:53am
I wanted the seat as low as possible...
Thanks! Result is perfect. The hose clamp guide worked great! Removed 5/8" (~16mm). Could have gone lower but I couldn't bring myself to drill a hole in the flag.

Couple pics.
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Re: Shave seat tube???

Posted: Nov 23 2020 1:43pm
by spinningmagnets
I like that you drilled a hole at the base of the split-cut.

If you didnt, a "stress riser" might develop, and a possible crack might grow in unpredictable directions...

Re: Shave seat tube???

Posted: Nov 23 2020 5:19pm
by JeffnAZ
spinningmagnets wrote:
Nov 23 2020 1:43pm
I like that you drilled a hole at the base of the split-cut.

If you didnt, a "stress riser" might develop, and a possible crack might grow in unpredictable directions...
Thanks... exactly why I drilled it. Your help and interest is much appreciated.