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Darth Lefty's kids' 20" Hotrock

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Darth Lefty's kids' 20" Hotrock

Old 02-23-20, 04:48 PM
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Darth Lefty's kids' 20" Hotrock

Well, after posting a thread last month about kid bikes, here we went and bought a used one. This is a Specialized Hotrock. I guess you'd say "late model" since it's maybe a year or two before the Riprock came out. It was solid, but filthy. I've started cleaning and lubing it. I so far have taken the following notes. This was partly done with voice dictation so there may be some amusing typos I've missed.Hotrock notes

Weights

4.36 pounds suspension fork with crown race and brake posts, it has coil spring, steel stanchions and steerer

3.68 pounds frame with headset and derailleur hanger and rack bolt.

1.34 pounds steel handlebar

3.15 pounds front wheel assembly with tire (tire is 1.2 lb worn out Specialized Roller, tube 0.28 lb)

4.38 pounds rear wheel assembly with tire & free wheel

1.93 pounds alloy cranks and plastic pedals. 36t steel ring swaged onto drive side crank, plastic bash guard

0.82 pounds bottom bracket and bolts. The bottom bracket is a weird half and half thing, the fixed cup is a cartridge and the other side adjusts like old times

0.50 pounds tensioner/guide - just remove. Note this means the included BB is for 73 not 68

1.32 pounds derailleur and chain

1.50 pounds seat, post, and collar. Post is aluminum single bolt - not steel and topper as feared

2.67 pounds control levers and brake arms and cables, stem spacers and cap. The top of the race is a big steel thing weighing a few ounces and I don't know why.

Sum 25.65 lb

Spacing is 135. Head tube 1-1/8. Seat post is 27.2 mm diameter. BB shell 68mm. Kickstand plate included. Frame and fork both have provisions for both disk and V brakes, V included.

Cranks are 127 mm long. Bottom bracket is 118 square taper. Hubs have aluminum shells and nutted solid axles, crusty. Prior owner replaced drivetrain w Altus RD, 7 speed FW, trigger shifter, bypassing the chain guide. Rear brake replaced with a Tektro lever & arms. Lock on grips.

I planned to paint it and told kiddo to pick colors. He at first told me that he wanted it to be black on one side and green on the other side with pink in the back. I had a pretty cool plan for this in mind using spray.bike paint cans, but now he tells me he was just kidding. Ha, Ha, Ha. I think he’s pleased with how it looks now that I cleaned up the frame. I know I am. But I was really looking forward to trying the paint job.

The only immediate project is cleaning it up and making it run smoothly, new tires, new BB (Ali Express Ti), replacing the handlebar (Amazon carbon). I'm not sure what to do about the suspension fork, it is a typical cheap Suntour unit. Heavy AF and no damping but not likely to break down, way better than a Walmart bike. I'll probably just leave it unless one of the kids begins to exhibit shredding talent before they all three outgrow it. I hope the hubs are ok. Can the axles be replaced with hollow ones, if I buy a complete axle assembly? If so that's cheap and I can get Ti skewers, if not I have a nice 135 x 32h disc hub from the Box'O'Crap V6 that I could build a wheel on.


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Old 02-23-20, 04:53 PM
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Nice....my 9 year old has that bike got it last year. Loves it!!
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Old 02-28-20, 04:28 PM
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It is possible to convert solid axle to quick release (hollow) axles. RJ on youtube has all sorts of helpful videos, search hub axle conversion solid to quick release, you'll find the one he made specifically for this.
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Old 03-01-20, 09:23 AM
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I rebuilt the hubs, or tried. At least I did the front one. The rear axle is bent, as is traditional. I didn't do a very good job cleaning up the drive side because I don't have a remover that fits the Sunrace freewheel, and something in there is rubbing. I'm going to build in that other hub I mentioned. This will also give the option of disk brake and 8+speeds.

Kiddo still hasn't really decided about the color. We were at the bike shop and we saw a few and he got a case of the well-actually.

All three kiddos went to the city bike park for the first time yesterday. Oldest was a little slow but could pedal on the pump track. Balance biker girl twin is scary fast and fearless, balance biker boy twin just isn't getting it yet but loves to have his bike.
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Old 03-04-20, 03:33 PM
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Just ordered two 40-packs of 192mm DB spokes from CRC. Would not have bought DB because it's just a kid bike but these were crazy cheap (40/$13).
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Old 03-08-20, 06:39 PM
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Sad state of affairs

Kiddo still canít pick a color. Today it was green.


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Old 03-08-20, 10:53 PM
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What is crc? I'd like to rebuild a couple kids wheels.
its a good looking bike as is. I just ordered some schwalbe rocket Ron from bike24, their flat rate 20
Euro shipping is rough but I needed 4 of those and 2+shipping is less than the cost of one here in the states made 4 real cheap. They also have 20 and 24" air shocks around the 100.00 price range, haven't found the same shock for less than 180 from US sellers. The kids air shocks are lighter. About an 80g savings over stock, but the stock 24" I'm replacing is lighter than you 20" so you'd do better still.
The rocket Ron is one of the lightest kid's tire as well, the small block 8 they're replacing is close though and available at decent prices. Just the RR performs better and my kids are trying to ride harder. Either tire will shave some weight and get them moving off-road.
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Old 03-08-20, 11:54 PM
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Glad to have you along!

CRC = Chain Reaction

I'm going for durable and cost effective not ultralight. If I can save some gauche amount of weight thatís great but itís got to survive three kids in sequence and itís already used. Iím probably getting some of those classic BMX tires
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Old 03-09-20, 06:27 AM
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My 7yo is within an inch of the 9yo so the youngest gets double the hand down bikes. So mine only have to survive 2 kids. I made the mistake of buying used trek 220 which are hopelessly heavy but at 2 for 50.00 it's not a big deal. Just meant new bikes from Santa since both took to the trails and pump track. Just means the treks make good ride to school bikes since those get kicked around at the racks by everyone and the nice bikes only get scratched and dinged by the rocks. Having kids who love bikes is a joy to keep up with though.
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Old 03-30-20, 10:59 AM
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The Chain Reaction spoke order never left the warehouse so ordered another batch of straight gauge ones from Jenson
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Old 04-02-20, 07:39 AM
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Originally Posted by Darth Lefty View Post
The Chain Reaction spoke order never left the warehouse so ordered another batch of straight gauge ones from Jenson
Shoot - I would have recommended J&R bicycle (BMX supply) as a good source for double butted.
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Old 04-02-20, 07:41 AM
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Hubs, nipples and DB spokes for a BMX race wheel build for my oldest's next bike
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Old 04-04-20, 01:00 AM
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I finished truing up the wheel. The DS spokes are a skosh too long thanks to the deeper dish of the free hub and larger flange on the drive side. The rim is deep single wall style, I guess I can use some folded over tape.

And what the heck is up with this spacing? (Edit: I left out the derailleur hanger, that's what's up)



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Old 04-04-20, 05:37 PM
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I think I found the same when I converted my son's 24" hotrock street to a hollow axle to use on my Wahoo Kickr Snap - it pulled in with the skewer no problem as I remember.
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Old 04-04-20, 05:51 PM
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Nope, I did a stupid. That's with the derailleur hanger out.
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