How to – NS Capital integrated seat post chop modification

The integrated seat post on my 2014 NS Capital frame is something that I’ve struggled to get on with, It’s just too low and therefore I decided to cut it off mine so that I could put in a normal seat post and adjust the height. This short guide will show you the steps that I took to complete the modification.  The process is pretty simple, however, It’s vital to use the correct safety equipment at all times and also use tools that are fit for the job. If you are unsure, then either get somebody else who you trust to do it, or just don’t do it. I’m unsure if this affects warranty of the frame and therefore assume that it would void any that exists on the frame. However, I could be wrong. Notes: I measured the inside diameter of the frame’s seattube to be 27.2mm~

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Internal diameter of seat tube. I went with a 27.2mm post. The measurement is larger because of the cut that I made.

I measured the outside diameter of the frame’s seattube to be 30.2mm~

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I measured 30.2mm on the outer diameter of my seat tube. I’d recommend a 30.0mm or 30.8mm seat clamp.

Bike parts required after mod: 27.2mm seatpost 30mm-30.8mm seatclamp (I went with 30.8mm which is just too loose, 30mm would be better). I advise you double check for yourself by measuring with a set of vernier callipers. Required tools: Hacksaw, power drill with 6mm drill bit, file, grinder with cutting disc. Before starting, you should have already removed your seat and rear wheel at least. A bike stand or somewhere to hold the bike still also helps to cut straight lines in the frame and ensure the best outcome. Step one: Mark out a straight line on the frame where you intend to cut the integrated seat post off. This line should leave about 15mm of the seat tube for a seat clamp to go onto afterwards.

NS Capital 2014 seatpost frame mtb street pivotal

Post before cutting.

Step two: Chop the integrated seat post off carefully once you’re happy that your line is straight.

NS Capital 2014 seatpost frame mtb street pivotal

Take your hacksaw and chop off the integrated post.

NS Capital 2014 seatpost frame mtb street pivotal

Integrated post chopped off.

If you’re using a wedge post, there is no need to continue from this point. The job is complete. Step three: Drill a hole on the back of the seat tube and about 20mm from the top of where you have cut. This is for when using a seat clamp.

NS Capital 2014 seatpost frame mtb street pivotal

Carefully drill a central hole. You might want to put a pilot hole in the frame first or even use a punch and hammer to make it easier to drill on the correct spot.

NS Capital 2014 seatpost frame mtb street pivotal

Finished hole drilled neatly.

Step four: Get a pen and mark out a central, vertical line down the back of the seat tube that will run down the hole that you drilled in the previous step. Get your grinder with cutting disc and cut a slot vertically from the top of the seat tube, down to the hole that you drilled in the previous step.

NS Capital 2014 seatpost frame mtb street pivotal

Make sure to wear safety gloves and goggles. Apologies for my bad example, however, I was wearing goggles.

NS Capital 2014 seatpost frame mtb street pivotal

This is what the cut should look like, be careful not to cut the other side of the frame by cutting too deep. Be careful of any sharp burrs.

Step five: Get your file and get rid of any sharp burrs. I found that there was also some on the inside of the frame from the manufacturing process.

NS Capital 2014 seatpost frame mtb street pivotal

As you can see, there are left over burrs from manufacturing. You need to remove these with a file so that the seat post goes into the frame easily.

NS Capital 2014 seatpost frame mtb street pivotal

Use the file to remove any sharp burrs that have been made by any cutting or drilling.

Step six: Re-assemble your bike by fitting a seat post and clamp, and then adjust the new seat post to a desired height. NS Capital 2014 seatpost frame mtb street pivotal seat post tioga s&m s and m seat The modification is now complete.

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