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My youngest son is now riding a small sized Specialized Pitch. To stand over the bike, the seat is dropped to almost its lowest position. But when pedaling, I noticed that the seat needs to be raised in order to get decent extension of the legs. So I was wondering if a dropper post is the solution. If so, how much travel should the dropper post have for a kid that is 5 foot tall.
 

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My youngest son is now riding a small sized Specialized Pitch. To stand over the bike, the seat is dropped to almost its lowest position. But when pedaling, I noticed that the seat needs to be raised in order to get decent extension of the legs. So I was wondering if a dropper post is the solution. If so, how much travel should the dropper post have for a kid that is 5 foot tall.
You need to measure it yourself.
Assuming you have correct sized cranks for their height (155 would be a maximum for the cranks but you can buy these off the shelf)
My 9yr old has 142mm cranks and 120mm dropper


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You don't stand over the bike with your butt on the seat. If you can have both feet flat on the ground with your butt on the seat your seat is too low. You want to set the seat at the right height for pedaling, not for sitting on the seat with both feet on the ground....

Standover is done over the top tube, not the seat, from there, put a foot on the pedal, push off, then get your butt on the seat. It took some time to teach my daughter this one. She complained her seat was too high and kept trying to start off with her butt on the seat on her tip toes.... Habits learned from kids bikes, gotta break em...

If he is stopped with his butt on the seat, his bike should be leaned over at an angle to get one foot flat on the ground. If you have both feet on the ground, you should be off the seat.

That said, a dropper wouldn't be a bad idea if he rides anything more than dirt roads. I have a brand X ascend II on my pitch, it's an XL frame but the small size frame has the same length seatpost as my xl, so it will fit fine. The ascend II is 125mm of drop, which is plenty for me at my skill level and 6'1" height, so certainly enough for a 5' kid. . But make sure he has 150+mm of seat post above the clamp with the seat at pedaling height or it will be too tall fully extended. If he has less than that you will want to look for a 100mm dropper.
 
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