Cut an integrated seat post

[goose11]

Hi all,

Can't seem to find an answer to this anywhere...

Can anyone offer any advice on best practice when cutting an integrated seat post? Just got new carbon beauty - had a brief measure when it was purchased and about 1cm taken off. However it is still too tall, but I reckon up to about 4cm's. Leg fully extended on the bottom of the stroke and foot not flat...



Can anyone offer any advice on:

a) best measure point to cut to?

b) how exactly to cut the post? I don’t want to ruin the bike by buggering up the cut - kind of only one shot at this.




I'm guessing cutting slightly (.5cm) short is OK - in as much I have a few spacers, which should give me some flex re new pedals / seatpost.No guides anywhere online to help with this and at a bit of a loss. Not sure the chap that sold me the bike really knew what he was doing so turning to the forum for help.

Anything is appreciated.

Thanks.

 

[fossyant]

Measure twice, cut once.

Get the bike set up, saddle mounted. Measure an existing bike (I assume you have a reference bike to go off that you are set up correctly for) and measure from centre of BB to Saddle rails.

check difference on both.

Are you using same pedal/shoe combo ? If not check difference in stack height.

Saddle - same ? if not check the rail to saddle top - again you need to add in all these differences, work out the optimum, and measure again.

Double check. You'll want the cut somewhere in the middle of your adjustment range.

How much adjustment do you have ?

Also get a very good blade to do the cut.

Otherwise cut allowing for a bit more post, then recheck, check again, then cut some more.

 

[Zoiders]

Never found that having your foot flat at the bottom of the stroke is the correct position IMHO.

That would indicate it being too small or the post too short - which I do not think is the case.

 

[mickle]

STOP.

Contact the manufacturer or the manufacturer's UK representative before you do anything.

Aside from anything else they should be informed that individuals employed by their dealers to sell their products don't know what they are doing. This is a failure of communication / training and a represents a dangerous liability for them. Do you know what happens to bike companies when folk get injured by their bikes? Schwinn is what happens.

Carbon fibres and the resin they live in may be harmful if ingested into the lungs. I limit my exposure to carbon fibre dust by mounting a vacuum cleaner hose close to the workpiece.

And it's measure three times before you cut not two....


Can't you take the dimension from your old bike ?

 

[goose11]

STOP.

Contact the manufacturer or the manufacturer's UK representative before you do anything.

Aside from anything else they should be informed that individuals employed by their dealers to sell their products don't know what they are doing. This is a failure of communication / training and a represents a dangerous liability for them. Do you know what happens to bike companies when folk get injured by their bikes? Schwinn is what happens.

Carbon fibres and the resin they live in may be harmful if ingested into the lungs. I limit my exposure to carbon fibre dust by mounting a vacuum cleaner hose close to the workpiece.

And it's measure three times before you cut not two....


Can't you take the dimension from your old bike ?

All fair points, thanks. Mickel - its not really a surprise - it was one of the major chains who are seldom known for their knowledge. I wouldn't suggest that they are getting it wrong on just this bike...

Appreciate measuring is key here and I can measure against my previous bike - currently with same pedal set up. This does of course, assume that my other bike is set up correctly. I have no reason to think that it isn't, but never had a professional fit so would be surprised if I had it perfect through my own efforts.

I have contacted the maufacturer already to ask for additional guidance - I would normally be happy to take this back to the store and get them to do the cut - however my less than 100% confidence in their abilities previously mean I'm left with a choice of either doing this myself or indeed paying for a professional fit (can't really do that right now...although would love to).

 

[youngoldbloke]

Try Googling 'cutting integrated seatpost' - theres a lot of stuff from Giant, Norco, other forum posts.

 

[dan_bo]

Did anyone mention to measure up at least seventeen times?

 

[dan_bo]

Did anyone mention to measure up at least seventeen times?

 

[dan_bo]

Did anyone mention to measure up at least seventeen times?

 

[TheDoctor]

A few times now!!

 

[e-rider]

I would measure five times, have a cup of tea, measure twice more, sleep on it over night and measure three more times in the morning. After that, mark it up ready and take to professional and get them to measure it.

...and next time buy a normal frame