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Discussion Starter · #1 ·
Here are my plans to convert my son's 2014 20" Hotrock into a lightweight XC bike. He's 5 years old and riding a Spawn Yoji 16 right now so I have a few months before he will need to upgrade.

My goal was to get him a 20" bike that's 17lbs or less for the cost of a new Hotrock or his Yoji ($400). I think I can sell off some old parts (seat, fork, wheels, tires) and get him well under $400. Drivetrain will be 9 speed Deore handed down from Mommy's bike since she's getting a 1x11 SLX upgrade. I'm wondering if I should upgrade cranks and chainring also?

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Btw as an aside, keep the 16" and you can use it as a makeshift BMX that he can ride for another 3 or so years. My 8 year old practices his tricks (Manuals, bunny hops, etc) on his sisters 16" Yoji. The geo is great and the bike is so light he can get the wheels off the ground easier.
 

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Discussion Starter · #3 ·
Btw as an aside, keep the 16" and you can use it as a makeshift BMX that he can ride for another 3 or so years. My 8 year old practices his tricks (Manuals, bunny hops, etc) on his sisters 16" Yoji. The geo is great and the bike is so light he can get the wheels off the ground easier.
Great idea! We'll be keeping it around anyway for his 3yo brother that's currently on a Hotrock 12
 

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Sounds like a fun project!

Seatpost will probably save you more than listed, since he likely won't need a full 350mm, so you could cut it down.

Don't forget the weight of grips - I only see handlebars on that list. I'd consider the Protaper Junit bars if you haven't gotten bars yet, though. They're more in both price and weight, but significantly better sized for kids hands.

Also don't see a stem on the list: likely an opportunity to drop a little weight there with a Wren stem.
 

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For grips the lightest I know of are the Lizard skins ESP. They'll save around 65g over a typical grip.

Aest Mag Ti pedals are 161g.

Run tubless and you don't have tube weight (also rolls better it seems).
 

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Discussion Starter · #7 ·
Sounds like a fun project!

Seatpost will probably save you more than listed, since he likely won't need a full 350mm, so you could cut it down.

Don't forget the weight of grips - I only see handlebars on that list. I'd consider the Protaper Junit bars if you haven't gotten bars yet, though. They're more in both price and weight, but significantly better sized for kids hands.

Also don't see a stem on the list: likely an opportunity to drop a little weight there with a Wren stem.
How much would a stem save me? Looks like half a pound for $60 which isn't that great compared to the rest of my mods. I might not be calculating correctly though.
 

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I'm also wondering what it would take to set it up tubeless. I thought the rims and tires had to be "tubeless ready"
Tubeless ready makes it easy and is all I've done personally. I suspect that many non tubeless rims and tires would mount up tubeless just fine though. I'd tape over the spoke holes, install a valve stem, and see if you can get them to seat. If they do, squiret in some Stan's and you are all set. If not Google ghetto tubeless.

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Discussion Starter · #14 ·
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My 5 year old finally started to outgrow his 16" Spawn Yoji so I finished up most of the 20" Hotrock build. A few changes and comments from my original build list:

1. Used Kactus pedals which are a little lighter.
2. I used the XTR derailer and XT shifter from my old bike
3. I reused the old tubes which were too big for the 1.9 tires. I hope to go tubeless soon.
4. I decided to order Spawn 127mm crank set. I found one of my oem cranks was stripped plus the spawn will give me better gearing and a narrow wide setup for better chain retention.

Final weight was around 17lbs and should be close to 16lbs with the new cranks and bottom bracket plus losing the tubes. Cost will be around $500 but I hope to sell off some old parts for $50 - $100. Overall, very pleased! My son hadn't had it on the trail yet but was climbing stuff around our property that he could never do on the spawn.
 
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