如何變速
資料來源：http://bicycletutor.com/gear-shifting/
02:14 - Never use either the large/large or small/small gear combination!Most bikes these days come with ‘21 speeds’. However, this doesn’t mean you have 21 useable gears. Actually, on a 21 speed system it’s closer to 13. A lot of people get confused by all of the gear combinations available. I myself didn’t understand it when I first started using a multi-speed bike, so today we’ll learn how to use your gears most effectively.
It’s very important not to shift under pressure, as this will cause shift problems and damage your drivetrain. If you’re going uphill and you need a lower gear, keep pedaling, but ease off and pedal lightly while you shift.
Most systems have three gears on the front, which are controlled by your left shifter. The rear gear cluster usually has 7 gears, with some systems having 8 or 9. Not to worry, the concepts here are the same.
For most everday riding, you’ll want to keep your chain on the middle ring on the front, or number 2 on your left shifter. This allows you to use the full range of rear gears. Number 1 on your right shifter is the easiest gear for climbing hills, as it puts your chain on the largest rear sprocket. Number 7 on your right shifter is the hardest gear for going really fast, and it puts your chain on the smallest rear sprocket.
I find it helps to think of numbers 1 and 3 on your left shifter as options for extreme circumstances.
If you’re climbing a really tough hill and your left 2 and right 1 combination aren’t easy enough, you can shift your front derailleur to number 1 which drops the chain down to the smallest front chainring. While you’re in the smallest front gear you can shift the rear gears between 1 and 3 for a finer range adjustment, but you should always shift the front back to 2, or the middle chainring before using gears 4-7 on the rear.
If you’re going really fast and need a harder gear, and your left 2 and right 7 combination isn’t fast enough, you can shift your front derailleur to number 3 which pulls the chain up to the largest front chainring. While you’re in the largest front chainring you can shift the rear gears between 5 and 7 for a finer range adjustment, but always shift the front back to 2, or the middle chainring before using gears 1-4 on the rear.
Never use the full range of rear gears when you’re in either the small or large front sprockets (number 1 or 3 on the front shifter). This causes too great an angle in your chain line, which can cause noise and shifting problems.
目前市面上的登山車的變速器有許多種，「21速、24速、27速」，以21速為例 真正可利用的，僅約為13段而已，許多人對於這些齒輪比相當困擾，當我自己第一次使用時我並不瞭解該如何使用這些多速的自行車，以下我們將學習如何讓使用您的變速，讓您的齒輪更有效率。
有一件很重要的事就是盡量不要在有壓力時（例如上坡）變速，這些會導致變速的問題並且會傷害您的變速器。當您在上坡時您需要較小的齒輪，持續的踩踏，但是務必記得，不要在上坡重踩的情況下變速。
大多數的變速系統前面會有三片大盤，由您左邊的變速桿來控制。後變速大多數為7速，目前市面上也有很多8片或9片的，其原理都是一樣的。
對於常騎車的您，您會想要將您的鍊條保持在前變速的第二盤，這會使您可以使用到後面的所有變速。前變速的最小盤是讓您在爬山時最輕鬆的一盤；而將後變速放到最大盤會讓您的騎乘速度最快。
我個人的感覺是，前變速的第一盤及第三盤是您可以利用在特殊的騎乘狀況下的，平常的騎乘以第二片為主，搭配後變速使用。
當您騎乘在較陡峭的山路時，您前變速放第二盤，後變速放最小盤並沒辦法讓您感覺很輕鬆的話，您可以將您的前變速放到最小片。當您使用最小的前變速時，您可以把後變速由最小的一到三片間變化調整使用；但是在正常狀況下您應該將前變速放到第二盤，然後把後變速由第四到第七（八）片間調整使用。
如果您想要追求的是快速的騎乘或是較重的齒盤，前變第二盤及後變第七盤的組合是不夠快速的，您可將您的前變速放到最大的一片，當您的前變速是最大的那一片時，您可以將後變速由第五片到第七片中間調整使用。但記得平常的騎乘將前變速放到第二盤，然後把後變速由第四到第七（八）片間調整使用。
千萬不要在前變速最大片或最小片的時候轉換所有的後變速的段別，將會造成許多噪音及變速器的問題。
資料來源：http://bicycletutor.com/gear-shifting/
02:14 - Never use either the large/large or small/small gear combination!Most bikes these days come with ‘21 speeds’. However, this doesn’t mean you have 21 useable gears. Actually, on a 21 speed system it’s closer to 13. A lot of people get confused by all of the gear combinations available. I myself didn’t understand it when I first started using a multi-speed bike, so today we’ll learn how to use your gears most effectively.
It’s very important not to shift under pressure, as this will cause shift problems and damage your drivetrain. If you’re going uphill and you need a lower gear, keep pedaling, but ease off and pedal lightly while you shift.
Most systems have three gears on the front, which are controlled by your left shifter. The rear gear cluster usually has 7 gears, with some systems having 8 or 9. Not to worry, the concepts here are the same.
For most everday riding, you’ll want to keep your chain on the middle ring on the front, or number 2 on your left shifter. This allows you to use the full range of rear gears. Number 1 on your right shifter is the easiest gear for climbing hills, as it puts your chain on the largest rear sprocket. Number 7 on your right shifter is the hardest gear for going really fast, and it puts your chain on the smallest rear sprocket.
I find it helps to think of numbers 1 and 3 on your left shifter as options for extreme circumstances.
If you’re climbing a really tough hill and your left 2 and right 1 combination aren’t easy enough, you can shift your front derailleur to number 1 which drops the chain down to the smallest front chainring. While you’re in the smallest front gear you can shift the rear gears between 1 and 3 for a finer range adjustment, but you should always shift the front back to 2, or the middle chainring before using gears 4-7 on the rear.
If you’re going really fast and need a harder gear, and your left 2 and right 7 combination isn’t fast enough, you can shift your front derailleur to number 3 which pulls the chain up to the largest front chainring. While you’re in the largest front chainring you can shift the rear gears between 5 and 7 for a finer range adjustment, but always shift the front back to 2, or the middle chainring before using gears 1-4 on the rear.
Never use the full range of rear gears when you’re in either the small or large front sprockets (number 1 or 3 on the front shifter). This causes too great an angle in your chain line, which can cause noise and shifting problems.
目前市面上的登山車的變速器有許多種，「21速、24速、27速」，以21速為例 真正可利用的，僅約為13段而已，許多人對於這些齒輪比相當困擾，當我自己第一次使用時我並不瞭解該如何使用這些多速的自行車，以下我們將學習如何讓使用您的變速，讓您的齒輪更有效率。
有一件很重要的事就是盡量不要在有壓力時（例如上坡）變速，這些會導致變速的問題並且會傷害您的變速器。當您在上坡時您需要較小的齒輪，持續的踩踏，但是務必記得，不要在上坡重踩的情況下變速。
大多數的變速系統前面會有三片大盤，由您左邊的變速桿來控制。後變速大多數為7速，目前市面上也有很多8片或9片的，其原理都是一樣的。
對於常騎車的您，您會想要將您的鍊條保持在前變速的第二盤，這會使您可以使用到後面的所有變速。前變速的最小盤是讓您在爬山時最輕鬆的一盤；而將後變速放到最大盤會讓您的騎乘速度最快。
我個人的感覺是，前變速的第一盤及第三盤是您可以利用在特殊的騎乘狀況下的，平常的騎乘以第二片為主，搭配後變速使用。
當您騎乘在較陡峭的山路時，您前變速放第二盤，後變速放最小盤並沒辦法讓您感覺很輕鬆的話，您可以將您的前變速放到最小片。當您使用最小的前變速時，您可以把後變速由最小的一到三片間變化調整使用；但是在正常狀況下您應該將前變速放到第二盤，然後把後變速由第四到第七（八）片間調整使用。
如果您想要追求的是快速的騎乘或是較重的齒盤，前變第二盤及後變第七盤的組合是不夠快速的，您可將您的前變速放到最大的一片，當您的前變速是最大的那一片時，您可以將後變速由第五片到第七片中間調整使用。但記得平常的騎乘將前變速放到第二盤，然後把後變速由第四到第七（八）片間調整使用。
千萬不要在前變速最大片或最小片的時候轉換所有的後變速的段別，將會造成許多噪音及變速器的問題。
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