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Will cutting my seat tube weaken my frame?

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Will cutting my seat tube weaken my frame?
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flag Blk-Mrkt
Posted: Dec 8, 2009 at 23:46 Quote
Ok so the warranty on my frame is gonnnie burgers and was wondering if I cut my seat tube on my frame even like an inch-inch and a half, how will it affect the strength?
Me and my dad are arguing because I want to do it because my seat tube is mega big and I wanna cut it, and he is saying it will wreck it big time. Help me out please? Thanx
flag joram-adams
Posted: Dec 8, 2009 at 23:51 Quote
I don't think it will wreak your frame. I cut down my stg i-beam about 1 1/2 inches last year and it's still running strong. I'm not 100% sure if cutting it down will wreak your frame but from what I know you should be fine. Just make sure you file around where you cut internally and externally. Also keep the cut straight and clean because thats when problems will start happening. cheers. Imagine the horse as your bike LOL. >>>Dead Horse
flag Blk-Mrkt
Posted: Dec 8, 2009 at 23:54 Quote
joram-adams wrote:
I don't think it will wreak your frame. I cut down my stg i-beam about 1 1/2 inches last year and it's still running strong. I'm not 100% sure if cutting it down will wreak your frame but from what I know you should be fine. Just make sure you file around where you cut internally and externally. Also keep the cut straight and clean because thats when problems will start happening. cheers. Imagine the horse as your bike LOL. >>>Dead Horse

Cheers lol but I mean on my frame Confused Lol not my seat post Confused anyways thanx for your input Smile
flag joram-adams
Posted: Dec 9, 2009 at 0:10 Quote
Blk-Mrkt wrote:
joram-adams wrote:
I don't think it will wreak your frame. I cut down my stg i-beam about 1 1/2 inches last year and it's still running strong. I'm not 100% sure if cutting it down will wreak your frame but from what I know you should be fine. Just make sure you file around where you cut internally and externally. Also keep the cut straight and clean because thats when problems will start happening. cheers. Imagine the horse as your bike LOL. >>>Dead Horse

Cheers lol but I mean on my frame Confused Lol not my seat post Confused anyways thanx for your input Smile
I don't understand? how will it damage ur frame. Unless it's a really messy cut or you cut it too short then it'll be fine.
flag veet-88
Posted: Dec 9, 2009 at 0:28 Quote
cutting your seat tube on your frame can weaken the frame. its designed to be a certain length for a reason. I gaurentee that will void your warenty as well.

Ryan
flag joram-adams
Posted: Dec 9, 2009 at 0:30 Quote
veet-88 wrote:
cutting your seat tube on your frame can weaken the frame. its designed to be a certain length for a reason. I gaurentee that will void your warenty as well.

Ryan
His warrenty has all ready gone out the window.
flag woody-dh
Posted: Dec 9, 2009 at 0:30 Quote
Do you mean the seat-post or the down-tube (where the seat-post slides into)?

EDIT: Just realised and it depends on what your frame is made out of. If it's thin metal, then yes, it could because it wouldn't have the extra support strength.
flag joram-adams
Posted: Dec 9, 2009 at 0:32 Quote
OOOOOHHHHHHH, The seat tube! Facepalm Yes, cutting the seat tube will defiantly damage your frame. Please what ever you do, DO NOT CUT IT!
flag BSal
Posted: Dec 9, 2009 at 9:10 Quote
I cut the seat tube on my 08 cowan an inch. I rode it like usual and had no problems with it. I believe unless youre running your seat post with only two inches or less in the frame you will damage it. other than that I dont believe it will do any harm. My opinion is if you do it right youll be fine, but do it wrong and your seat tube might start to crack and could lead to failure around the seat tube/seat stay area. Its your frame, experiment away.
flag stomper
Posted: Dec 9, 2009 at 9:31 Quote
i cut about 6mm off my bmx frame
flag singlespeedtoday
Posted: Dec 9, 2009 at 9:35 Quote
I cut about a inch off my old Rocky Mountain Switch and it was perfectly fine. Just take it slow and do a good job.
flag ezekiel
Posted: Dec 9, 2009 at 10:30 Quote
woody-dh wrote:
Do you mean the seat-post or the down-tube (where the seat-post slides into)?

EDIT: Just realised and it depends on what your frame is made out of. If it's thin metal, then yes, it could because it wouldn't have the extra support strength.

The down tube is the tube that runs from the headtube to the bottom bracket shell. You put your seat post into the seat tube.
flag StrictlyBidness
Posted: Dec 9, 2009 at 11:34 Quote
pictures so we can see where your chainstays and seatstays are in relation to your seat tube. That would help quite a bit.
flag joexspocent92
Posted: Dec 9, 2009 at 19:28 Quote
what do you mean cut the seat tube? isnt that the hole where the seat post goes in? so are you trying to increase standover height?
flag BSal
Posted: Dec 9, 2009 at 19:37 Quote
joexspocent92 wrote:
what do you mean cut the seat tube? isnt that the hole where the seat post goes in? so are you trying to increase standover height?

That is exactly what he is trying to accomplish.

Pay attention to where the seat post clamp is in these two pictures. Same frame. The first pic is the second day I had it. 08 Kona Cowan large 17", I made it a 16".
photo
photo
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