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As long as the minumum length is inserted into the frame you will be structurally safe. You can buy a shorter post of course. However, if you need to drop the saddle all the way to the frame the bike is likely too large for you and possibly dangerous, as you will have no standover clearance.Seatpost length is a further consideration. While a longer post is generally regarded as offering more comfort, the amount of post ‘sticking out’ of the frame will largely be dependent on your frame size/geometry and your own dimensions (inside leg length etc).The CPSC rule in the US is that the seatpost must be inserted two diameters of the seatpost into the frame. If it’s a 27.2 mm seatpost, it must extend 54.4 mm into the frame, which is 2 1/8″.
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Does length of seatpost matter?
Seatpost length is a further consideration. While a longer post is generally regarded as offering more comfort, the amount of post ‘sticking out’ of the frame will largely be dependent on your frame size/geometry and your own dimensions (inside leg length etc).
How long should your seatpost be?
The CPSC rule in the US is that the seatpost must be inserted two diameters of the seatpost into the frame. If it’s a 27.2 mm seatpost, it must extend 54.4 mm into the frame, which is 2 1/8″.
I Need to Cut Two Inches Off
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Is it okay to cut seat post?
Condensed answer: A bicycle seat post can be cut as long as the new size respects the minimum insertion length of the seat post. Ignoring the minimum insertion length and cutting too much of the seat post will result in extra stress on the frame (seat tube) and may cause a crack.
How tall should your seatpost be?
Measure from the floor to the top of the book spine. Multiply that number by 0.883, and subtract 4mm (1/8th inch). The result is your proper bike seat height, measured from the center of the bottom bracket to the top of the seat, along the seat tube.
How long is a standard bike seat post?
The most common size is 27.2 mm (1.07 in) for most bikes, especially for the higher-quality models. BMX bikes commonly use 25.4 seatposts. In some modern bikes with thicker alloy or carbon tubing, larger diameters such as 30.9 mm are used.
Does seatpost need setback?
Seatposts are available in different offsets ranging from 0 degrees to 35 degrees. A setback post puts you further behind your crankset and a straight seatpost moves you closer. The amount of setback or offset is best determined through a basic bike fit at a participating bike shop.
How do I know what size seatpost I need?
To find out the diameter of your seatpost, you must remove the seatpost from the bicycle frame and look for the size, which is stamped just below the “Minimum Insert” line toward the bottom. The number will be a three-digit number (such as 26.8 or 27.2 or 31.6).
See some more details on the topic Can a seatpost be too long? here:
Seatpost too long? – Bike Forums
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As Kevin pointed out, the problem is the size of the bike, not the seatpost. It’s too big for you. Yes, you can cut the seatpost.
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Unless it fouls on something (like water bottle cage screws), it can’t cause a problem. It is possible to cut it, but you should also cross out …
How do you measure seatpost length?
The length of the post that comes out of the frame is known as the stack height. This is the distance from the top of the seatpost collar to where the seat rails would be in the saddle clamp if the post was all the way inserted in the frame.
Can I get a longer seat post on my bike?
You can adjust the seat post by making it higher (may require a longer seat post than you currently have). Also, some seat posts are straight, whereas others have a setback. The later will move the seat slightly further back on the bicycle.
Is it safe to cut seat tube?
Unless it’s a really messy cut or you cut it too short then it’ll be fine. cutting your seat tube on your frame can weaken the frame. its designed to be a certain length for a reason.
Seatpost Size – From Wrong To Right
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How much does it cost to cut off a seatpost?
Actually it’s more like the minimum insertion mark on the seatpost is 30% of the way up the post, cut three inches off and it will still be 30% of the way up the post, so less than 3″.
Can you shorten a suspension seatpost?
If the post cannot be slid all the way into the frame due to an obstruction it can be cut down to shorten it. As long as the minumum length is inserted into the frame you will be structurally safe. You can buy a shorter post of course.
Should you be able to touch the floor on a bike?
The height of your saddle is important for the most comfortable position and safe riding style. When you sit on the saddle, both feet should reach the floor and the balls of your feet should be touching the ground.
How do I know if my bike seat is too high?
Knee pain is one of the most common indicators of an incorrect saddle height. Typically, a saddle that is too low will result in pain at the front of the knee, but one that is too high creates pain behind the knee – or in the hamstrings as a result of overextension.
Where should sit bones be on saddle?
The optimal saddle width guarantees that the sit bones lie completely flat on the saddle. This is the only way in which pressure is relieved on the sensitive area in men and on the pubic arch in women and ensures more efficiency.
Can a 31.6 seatpost fit a 30.9 frame?
You can fit a narrower post into a wider frame using a shim (a thin sleeve of aluminium or plastic), for example a 30.9 mm dropper post into a 31.6 mm frame. However, there is no way to fit a wider post in a narrower frame, for example a 31.6 mm post into a 30.9 mm frame.
Does seatpost offset matter?
The zero offset helps to put those folks over the pedal easier. Zero offset posts also work well if the top tube (real or virtual) is longer then ideal. Moving the seat forward reduces the distance between the stem and the saddle.
What is a zero offset seatpost?
Seatposts can be zero offset, or come with layback. A zero offset seatpost will place the saddle directly above the clamp – though of course you can adjust it forward and back on the rails.
How do I choose a seatpost?
The dimensions of the seat tube can vary from bicycle to bicycle, so when choosing a seatpost, it’s important to get the correct diameter. The most common diameter is probably 27.2mm, but other sizes between 21.15 and 35mm are often found, as well. Seatposts also vary in length.
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What is a seatpost shim?
Seatpost shims are short pieces of tubing, usually made of PVC, thin aluminum or steel, used to increase the diameter of a seatpost. Shims have a cutoff which makes them expandable and facilitates the installation process.
Is a 56cm bike medium or large?
| Rider Height | Suggested Road Bike Size | |
|---|---|---|
| Feet & Inches | Centimetres | Frame Size (cm) |
| 5’6″ – 5’9″ | 168cm – 175cm | Medium (54cm – 55cm) |
| 5’9″ – 6’0″ | 175cm – 183cm | Large (56cm – 58cm) |
| 6’0″ – 6’3″ | 183cm – 191cm | X-Large (58cm – 60cm) |
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