Bicycle Seat Replacement and Positioning for One-Bolt Seatposts

はじめに

Replace your bicycle’s seat (officially known as a saddle) and upgrade your bike riding experience with this simple tutorial. Whether your seat has been mangled by a squirrel, is making your ride uncomfortable, or if you are just ready for a change, this guide will walk you through how to replace and position your new seat for maximum comfort. You can purchase a new bike seat from your local bike shop or online retailer.

A good bike seat in the correct position will not only provide a more comfortable ride, but also encourages good posture while minimizing unhealthy strain. It is important to make sure you have the best possible seat set-up for you, whether you are racing in the Olympics or just racing to class.

必要な工具と部品

手順1 Loosen Seat Bolt

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Loosen Seat Bolt: 手順 1、 3の画像 1

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Loosen Seat Bolt: 手順 1、 3の画像 2

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Loosen Seat Bolt: 手順 1、 3の画像 3

Before you begin the replacement, find the properly sized hex key for your bike's seat clamp bolt. It should fit snugly in the bolt and the bolt should turn with the hex key without slipping.
Access the bolt securing the seat clamp from underneath the saddle.
Use a hex key to loosen the bolt by turning counter clockwise until the seat can be removed from the clamp.

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手順2 Remove Seat

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Remove Seat: 手順 2、 2の画像 1

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Remove Seat: 手順 2、 2の画像 2

Remove the seat from the clamp.
It is possible that your clamp will disassemble into separate parts once the bolt is loosened. If the clamp has fully disassembled, keep track of its bolt, bottom plate, top plate, and nut.

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手順3 Align Clamp and Place on Rails

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Align Clamp and Place on Rails: 手順 3、 2の画像 1

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Align Clamp and Place on Rails: 手順 3、 2の画像 2

Position the new seat's rails into the seat clamp with the clamp lying approximately flat and in the center of the rails.

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手順4 Replace Bolt and Clamp

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Replace Bolt and Clamp: 手順 4、 3の画像 1

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Replace Bolt and Clamp: 手順 4、 3の画像 2

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Replace Bolt and Clamp: 手順 4、 3の画像 3

Replace the bolt by twisting it in the clockwise direction while holding the top nut in place.
This step may not be necessary if the clamp was not fully disassembled when removing the old seat.

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手順5 Tighten Bolt

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Tighten Bolt: 手順 5、 3の画像 1

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Tighten Bolt: 手順 5、 3の画像 2

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Tighten Bolt: 手順 5、 3の画像 3

Turn the bolt clockwise with the hex key to partially tighten the seat so it is stable enough to hold your weight.

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手順6 Check Position of Seat

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Check Position of Seat: 手順 6、 1の画像 1

Improper bike seat positioning can lead to discomfort while riding and even stress injuries.
Test the position of the new seat by sitting on it. You should be in a neutral position (like in the photo) which allows you to comfortably reach the handlebars. You should not have any uncomfortable pressure when you sit.
Check for a moderately arched back without strain in the shoulders, wrists, or hands.

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手順7 Adjust Seat if Cramped

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Adjust Seat if Cramped: 手順 7、 3の画像 1

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Adjust Seat if Cramped: 手順 7、 3の画像 2

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Adjust Seat if Cramped: 手順 7、 3の画像 3

If you feel cramped through the elbows and shoulders, have an uncomfortable negative arch in your back, or your upper torso is positioned directly above your arms (potentially causing wrist pain), your seat may be too far forward.
If your seat is too close to the handlebars, push the seat back and test it for comfort again.

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手順8 Adjust Seat if Overextended

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Adjust Seat if Overextended: 手順 8、 3の画像 1

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Adjust Seat if Overextended: 手順 8、 3の画像 2

Bicycle Seat Replacement and Positioning for One-Bolt Seatposts, Adjust Seat if Overextended: 手順 8、 3の画像 3

If you are overextending your arms, overarching your back, or feeling discomfort when reaching for the breaks, your seat may be too far backwards.
If your seat is too far away from the handlebars, push the seat forward and test it for comfort again.

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