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Kids 16" bike, want to upgrade chain ring

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Kids 16" bike, want to upgrade chain ring

Old 09-09-22, 07:49 AM
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cpdroach18
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Kids 16" bike, want to upgrade chain ring

Just bought my son a used Trek Jet 16 off of the Facebook marketplace. It is a solid bike but the chain ring is very small and the poor little guy is peddling his ass off and not going anywhere. I've been trying to research swapping out the chain ring for a larger one but have gotten nowhere. Any suggestions?
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Old 09-09-22, 08:36 AM
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Can you tell us the crankset style or will we have to do the research for you? Some kids bikes use a 1 piece crankset (use to be called "Ashtabula") that have removeable rings. Other bikes have a cotterless crankset with a swaged ring/arm connection and thus is non removeable. Andy
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Old 09-09-22, 08:54 AM
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Won't he outgrow that bike in, like, six months?
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Old 09-09-22, 10:44 AM
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Ditto what Andrew said. This type of bike almost always have one-piece crank and BMX style sprockets (in BMXland chain rings are called sprockets). You can find sprockets at BMX specialists:
https://jrbicycles.com/collections/s...ts/sprockets-1
I did the same swap on several of my kids' bikes when they were little. I went from big to small though because the Specialized Hot Rock series tended to have sprockets that were too large.
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Old 09-09-22, 10:55 AM
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cpdroach18
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Originally Posted by smd4 View Post
Won't he outgrow that bike in, like, six months?
Possibly. So that is a good reason not to try to make the bike better for my son for the time being? Sounds lazy to me
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Old 09-09-22, 10:57 AM
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One piece crank set
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Old 09-09-22, 03:47 PM
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So, next steps here: Ashtabula Sprocket Question
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Old 09-09-22, 04:03 PM
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Let him pedal his ass off. Might build some fast twitch muscles in his legs and grow up to be able to spin 140 cadence as an afterthought.
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Old 09-09-22, 04:07 PM
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Can you change the rear cog for a smaller one?
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Old 09-09-22, 06:08 PM
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Originally Posted by cpdroach18 View Post
Possibly. So that is a good reason not to try to make the bike better for my son for the time being? Sounds lazy to me
It depends. Kids grow (get bigger) and develop (bike) skills at all different rates. By the time you make it “perfect,” they may indeed, have outgrown it.

It may be a bit of a crapshoot to locate cranks; kids’ bike parts can be weirdly non-specific, especially at the under-20” wheel sizes. You can probably find a direct replacement, but it may not give you the sizes so you can find the “+1” size you’re looking for

You could also switch the rear cog for a smaller one; coaster-brake sprockets are available down to 14t, and way less expensive than a mini-BMX crank conversion
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Old 09-09-22, 06:30 PM
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If my dad had made my first bike harder to pedal, I would have been pissed!
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Old 09-10-22, 09:21 AM
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I switched a one piece crank on one of my kids bikes ( but went to a smaller front )

the crank was fairly inexpensive and it was easy to swap

eventually I moved them to lighter / bmx racers ... and then had to find larger rear cogs

miss those days - kids grew like weeds and now on their own
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