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Anyone ever deliberately cut / modify their metal frame ?

PB Forum :: All Mountain, Enduro & Cross-Country
Anyone ever deliberately cut / modify their metal frame ?

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flag 60ndown
Posted: Nov 1, 2019 at 6:35 Quote
At the seat post on lots of metal FS frames, there is a 'brace' from the frame top tube to the seat post. Im wondering if I can cut the brace out and cut the seat post down, grind/sand polish until smooth.

it looks to me like this simple modification might turn many cross country frame geometry bikes into more downhill enduro geometry style bikes (simply being able to get the seat 5" lower)

my question is does that brace also keep the frame rigid ? or is it just holding the set post up Big Grin
flag jamesashton
Posted: Nov 1, 2019 at 8:14 Quote
an xc bike will never be a dh bike. If you really want to get your seat that low, cut your seatpost, not your frame. If you drill your frame, and then take a massive hit, the frame could just snap in half. I wouldn't. And like I said, an xc bike will NEVER. EVER. be a dh or enduro bike
flag TibZ
Posted: Nov 1, 2019 at 8:19 Quote
60ndown wrote:
At the seat post on lots of metal FS frames, there is a 'brace' from the frame top tube to the seat post. Im wondering if I can cut the brace out and cut the seat post down, grind/sand polish until smooth.

it looks to me like this simple modification might turn many cross country frame geometry bikes into more downhill enduro geometry style bikes (simply being able to get the seat 5" lower)

my question is does that brace also keep the frame rigid ? or is it just holding the set post up Big Grin

Come on man. I hope you are not serious. You can cut a (very) few cm of the seat-tube, if you really feel the need to do so. But as already said by the previous reply, it will not change anything to the geometry and specifications of your frame.
flag mca896
Posted: Nov 1, 2019 at 10:48 Quote
60ndown wrote:
At the seat post on lots of metal FS frames, there is a 'brace' from the frame top tube to the seat post. Im wondering if I can cut the brace out and cut the seat post down, grind/sand polish until smooth.

it looks to me like this simple modification might turn many cross country frame geometry bikes into more downhill enduro geometry style bikes (simply being able to get the seat 5" lower)

my question is does that brace also keep the frame rigid ? or is it just holding the set post up Big Grin

Seat height has nothing to do with DH/enduro geometry, and you won't achieve the bike feel you're looking for simply by lowering the seat. If it's that much of a concern, save yourself the hassle and just remove the seat/post altogether. Stick a piece of wooden dowel in there to fill the hole.
flag Mntneer
O+
Posted: Nov 1, 2019 at 12:42 Quote
traqs wrote:
an xc bike will never be a dh bike. If you really want to get your seat that low, cut your seatpost, not your frame. If you drill your frame, and then take a massive hit, the frame could just snap in half. I wouldn't. And like I said, an xc bike will NEVER. EVER. be a dh or enduro bike

That's like how I'm always saying that an enduro bike will never be a dh bike
flag jamesashton
Posted: Nov 1, 2019 at 21:28 Quote
you see, say a dh bike has an "M" geometry, from the front axle to the seat post and down to the rear axle, follows the lines of a letter M. And what you want to do is cut out the middle of one of the sides of the M. It is still an M, just with some space in the middle. It will not change anything other than a weaker frame, and a hole in your frame
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