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Discussion Starter · #1 ·
I had some old road bike wheels with Shimano 600 (Ultegra) hubs and decided to do some measuring. The 600 rear hub used the same spoke length as the oem Precaliber hub, so I relaced the rim today with it. Add a spare LX derailleur and thumb shifter and the 11-32 cassette and chain off my wife's bike and it's ready to roll tomorrow.
 

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Discussion Starter · #2 ·
The good and bad of the swap:

good:
SRAM 3.0 rear derailleur works just fine
LX trigger shifter is easier for him to shift than the 6-speed twister

bad:
in the small cog I have chain rub against the dropout
the hanger was bent and I didn't even know, mainly because he mostly rides in 1/2/3
 

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turtles make me hot
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I did almost exactly the same thing. I made my son's Precaliber 8 speed with an XT hub, shifter and rear derailler. I think I went 11-32 on the cluster and 34 up front. He climbs everything on it.
 

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turtles make me hot
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No. He wanted these Tioga spider web pedals that were a lot of money. I put them on his bike and on the first ride, one of them smacked the back of his calf. The plastic pedals are back on the bike.
 

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Discussion Starter · #7 ·
This weekend I changed out the SRAM 3.0 rd to a Shimano LX and put a 11-34 cassette on. It's shifting perfectly now. Before, the cable pull difference between the 2 meant I could only adjust for one end of the cassette or the other but it was fine since he mainly rode in 1-2-3, maybe 4. Now he has all gears and a 9-speed chain fixed the rub also.

I have an older XT short cage rd on the way to get the chain further away from obstacles since the long cage on it now is only 2" or so from the ground.
 

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Mmm... Tasty
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I did the same thing with my son's specialized hotrock 20. Swapped out the rear hub, threw on a 12-32 8sp cassette, a rapidfire shifter, and a 32t chainring. So far, that seems like a reasonable gear combination and gets him going everywhere. The long cage LX rear derailleur does certainly hang low, though...
 

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Discussion Starter · #11 ·
The new (used) XT rd is on and gives much better clearance, plus is just a nicer/lighter derailleur than the LX long cage and is regular rise instead of rapid rise.

Both pics are with it at the lowest point it could be.

LX:


XT:
 

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Discussion Starter · #15 ·
I did actually. I took the preload adjuster out and cut off 1/2 the threads to lessen the preload. It was a free mod and might soften it a little on bumps, so I figured it won't hurt.
 

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Cool, thing is my version only has crappy forks (i guess like nearly all stock 20" HTs) and there's no preload adjust. Any advice on swapping to a rigid fork or idea on how I can open her up and swap some springs maybe??
 

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Discussion Starter · #17 ·
Are you sure? It's just a plastic knob on one leg from what I remember.

Take a look at whatever is holding the spring in the fork, take that out and see if you can cut the threads down safely.
 

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Unfortunately, yes - no knobs, just covers. Its this one - trekbicyclestores . com/product/09gary-fisher-boys-precaliber-20-49209-1. htm

Took it to a couple LBS to see if they could advise why my lad (at 65lbs) gets a decent cushion over bumps, but if he lifts the front while riding or drops off the kerb he bottoms out (I swear there's only 20mm max travel after measuring with tape measure!). Only one side has something in there, other is completely empty.
 
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