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Part Two of the Specialized Riprock 20

Updated: May 31, 2020


The original intention of this bike was to lighten the wheels up a bit to make it easier for a kid to push this thing around. The bike has seen many miles of fun and was in need of a refresh for little brother, along with a unique identity.


The Fork: The upgraded original fork was carbon fiber and saw some wear due to the bike rack so a swap was in order. The new fork chosen was sourced from https://www.trailcraftcycles.com. The fork is aluminum, straight steer with a similar axle to crown measurement as not to change the geo too much. you can find it here: https://www.trailcraftcycles.com/product/trailcraft-aluminum-fork/ for a very reasonable price.


The cranks: I would say the the heaviest component on the stock bike was the crankset. It uses a square taper BB that is a lead weight. The trailcraft aluminum crankset is great for kids. They have some good kid sizing and the cranks come with a BB and a chainring for a good price. They are also much lighter than stock. you can also find them here: https://www.trailcraftcycles.com/product/trailcraft-direct-mount-cranks/


Disclaimer: I have no ties to trailcraft cycles, just giving credit where is is due. Good components for a reasonable price that are well suited for kids projects.


Brakes: the original mechanical disc brakes were good enough but needed to be upgraded after many miles. I chose the Shimano MT-201 hydraulic disc brake. They are cheap and work great for kids and the stopping power is much better than stock.


Drivetrain: The drivetrain was replaced with something that not only functions better but saves a bit of weight too. The Shimano ZEE FR derailleur fit nice on this bike due to the lower profile and is also a 10 speed system. Nothing else will fit on this bike due to the chain line and large rear tire. The cassette is an 11-36 with a 26T front ring. This equates to some real easy pedaling for kids if needed. The shifting and functionality of the system is also much greater.


The wheels have many miles on them and are still the same as day one. Again, you could drop some weight with a tubeless setup but I haven't tried to set that up.



The final weight of the bike is right at 19.5 pounds with pedals and the mandatory speedometer. A considerable difference from stock and should be the standard for kids bikes.


In the End, this bike has been ridden many miles and will be ridden many more so the cost to upgrade is well worth it to me, you can really see a difference in bike handling and ability with a proper setup bike for kids.

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11 commentaires


landon bonte
landon bonte
10 mai 2021

What grips and stem are you running?

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orbwheels
orbwheels
06 févr. 2021

Thanks. Those spawn cranks are basically the exact stock ones. Check out the eXotic forks, they would be an alternative option as well.

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eric blain
eric blain
30 janv. 2021

Thanks for all the tips and tricks! any other suggestions on fork and crankset as it appears those got hit by the shortage of bike parts? or do you know if you were buying something like this https://spawncycles.com/spawn-cycles-alloy-cranks-127 what BB would you need? or just any old square taper bb work? but i guess then you are defeating the purpose of trying to lighten it up. i think the fork would be a game changers for little brother trying to keep up with big brother. too bad its not in stock! let me know if you have any other suggestions. thanks again

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orbwheels
orbwheels
09 juin 2020

I actually rebuilt the stock rims with new hubs and spokes. That was all covered in part one. If the hub uses a dedicated 7 speed width freehub it will be too short to put a 10 speed cassette on it. If there was a spacer behind the stock cassette it should work, if not you'll need a new hub. I never noticed or really looked at it because I was swapping it.

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David Jones
David Jones
09 juin 2020

Did you change the free hub from stock? The 11-36 isn’t working with the stock free hub. Any thoughts?

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