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My daughter is 11 years old. She is growing fast and for her age, she is quite tall (154cm). Her bicycle is too small for her now so I'd like to get her a new one.

The question is: should I look for a kid's bicycle for her or would it make more sense to get a normal bicycle; maybe something like a XS size? My guess is a frame size of 48 ~ 50 cm should be right for her. Do kid's bicycles have anything especial besides being maybe simpler when it comes to using gears, etc? Would an adult bicycle be too complicated for her?

Her old bicycle is an Islabike which is around 9 kg and comes with SRAM X4 Gripshift (32 tooth chainring with 12-32 wide range rear cassette). It was simple enough for her at age 7, when bought it.

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    Some manufacturers have ladie's bicycles on their lists. 154cm would probably fit in that range. – Carel Jun 12 '19 at 9:57
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    It might be interesting to address this question to Islabike as well. For younger children they argue that physiological differences are more than smaller size and require a different approach to bike geometry. (Note: Islabike is a British manufacturer that specialises in high quality children's and youth bikes. Their starting point were cyclo-cross bikes for teens in competitions.) – gschenk Jun 12 '19 at 13:23
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    Yep, go XS, might be a bit large, but you (or the bike shop) can change the setup to fit her better. If the budget allows and they are available in the style bike you like, I would suggest a 1x drive train (No front gears). One thing to watch with adult bikes is crank lengths, even on XS bikes, are typically the standard 170-175mm. An 11 yo will have the flexibility on the knees and hips to cope, but a shorter (165cm, or even shorter) crank is better. – mattnz Jun 12 '19 at 22:25
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You are correct that there isn't anything intrinsically different between bikes designed for preteens and adult bikes. Kids bikes tend to have lower end, inexpensive components and drivetrains with a single front chainring only.

A adult bike will come with multiple front chainrings and front derailleur and shifter, so your daughter will have to learn to use those as well as the rear gears, but that isn't particularly difficult. Less expensive mountain or hybrid bikes will come with a triple front crank, if you want to simplify gear shifting to start with put the chain in the middle ring just shift the rear gears.

One concern would be the wheels may have quick releases instead of nuts on threaded axles, which might become unsecured with obvious bad consequences. The quick releases would have to be tightened enough so they couldn't be undone easily, and your daughter would have to know to not ride the bike if one or both come loose.

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I would go for the adult version of the bike you would buy for her if you were buying a new kids bike.

There is a whole range of bicycles for small adults which are basically not that different from kid bikes, just bigger.

If your bike shop does not have something you find fitting (for a girl her age) search on.

I live in the Netherlands where a lot of children are tall but we still have smaller adults who are in the same size range. Bikes fitting adults also fit children who are the same size.

It may well be that in a few years you will buy her a new bike again, fitting her adult size. So consider her 'new bike' as a further kids bike which happens to be an adult size frame.

If in your area gears are needed, get a bike with enough gears for her, at 11 she is old enough for two sets of gears, but do teach her how to use them.

In the Netherlands most kids get new bikes before going to secondary school, that is around 11 or 12 years old, and most of those bikes are very sturdy, as school bike sheds are hard on bikes.
Most of those bikes are adult frames in the smaller ends of the range (although some of those kids are already as tall as the average adult.)
If your child will not cycle to school, only for fun or only with you, you can select the bike based on that, and keep an eye on it as well.

An other thing the average teen in the Netherlands has to face is lessons in bike repair and maintenance. I have been patching my own tubes (and replaced the tyres) since I was not yet 12 and I was certainly not the only one in school who did.

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