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Build thread: 24" full disc tubeless pure trials


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I'm planning to build my dream bike, in which things I like about trials bikes are combining: 24" wheels, high bb, comp geo and Hope disc brakes. 

I used to build bikes as light as possible, but this one will be a bit different. I'll try to build this bike with the main accent on stiffness, but still saving weight where possible.

The first parts are already here!

 

Titanium pedal cages made by Racing Line for my Trialtech Jack Carthy pedals. I've bent and broken the original 2-mm alu cages really quickly. These titanium cages should be much more durable, but we'll see.
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Rockman cranks. I love silver cranks because unlike black ones, they still look cool after a few scratches. Always liked the look of the Rockman CNC cranks, and finally got my hands on these. 
I've been using 300-g ultra-light Born cranks for 5 years. They were quite flexible, but held really well until the left one snapped. These 413-g cranks should be stiffer yet not too heavy.
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Trialtech lever blades for Hope Trial Zone. I really love the shape of the blade on Trialtech rim levers that I used before. It seems like they are the only blades on the market that are designed specifically for 1-finger usage. And they are also pretty stiff. So hopefully this will be a significant upgrade for my Hope levers.
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Edited by Target
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New full black Clean Pro 24° stem just arrived! 

I went with a very short stem by today's standards - 125 mm. But I think with the Gu 24" frame and high rise bar that would be fine.

I've used more traditional 150*30 stem before with the Clean 107 mm handlebar rotated forward, and it was too low and too far forward, felt strange even for front wheel moves. Then I tried different bars and stems, and came up with the solution that feels amazing - 127*27 stem with high rise Clean 107 bar rotated a bit more upwards than usual.

The idea is that with 73° head angle frame you need shorter stem than with traditional 72° frame. And having a frame with a short 108 mm head tube, you have to compensate it somehow, for example by rotating the bar slightly upwards, and with adding some spacers.

There is a very significant difference between old Clean Pro 27.8° stem and this new one - new one is 78 (!) g lighter. Hopefully this new one still feels stiff.

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Edited by Target
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Degreased the KMC Z1eHX chain. I prefer to use wax based lubes (such as Squirt Chain Lube) for my chains. It's so good to have a chain that is always clean, doesn't attract dirt and doesn't leave greasy chain marks if you accidentally touch it with your fingers or clothes.

In order to apply a wax lube, you need to completely remove the factory grease first. I put a new chain in a bottle with degreaser, shake it vigorously and let it stay there for a few hours.
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2 hours ago, PLIW said:

What degreaser do you use?

Not sure, just the one with the "Degreaser" label on it from the local store. I don't think that's super important, anything with degreasing properties would work really.

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Finished painting matte black the Neon Single Wall rims.

These lightweight rims work surprisingly well for me. I've been using the previous pair of Neon rims for 5 years until the front one got bent and the rear one cracked. Pretty reasonable life time for such a low weight and low price, so I bought a new pair.

They seem to be out of production, I managed to find some last items in stock. The front one was available only in golden, hence the repainting.

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6 hours ago, MaderaMark said:

if only I have extra budget for a 24 pure trials, I would love to build one...

24 pure never got it's day in the sun. Just get a mod instead; a world of choices and great disc performance. 24 pures are all tradeoff and no advantages sadly.

 

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On 11/4/2021 at 0:17 AM, Swoofty said:

24 pure never got it's day in the sun. Just get a mod instead; a world of choices and great disc performance. 24 pures are all tradeoff and no advantages sadly.

 

24 for a playbike would be ok for my height. 26 felt too big, handlebars at almost shoulder in rear wheel hop position and I can't squat a lot because of the reach. I am using a 110mm stem from 132mm.

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  • 2 weeks later...

Some new toys have arrived:

Jitsie bashring.
I've used Trialtech Sport Lite, but being the lightest on the market (11 g), it bends too easily. So I went with a slightly heavier option.
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Echo Spanish titanium bottom bracket.
I've been using one for the last five years without any issues, so I bought a new one just to be on the safe side.
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Carbon headset spacers with a matte finish.
For the previous builds, I've used some very lightweight CNC carbon spacers with 1 mm thick wall. And as it turned out, the can snap from trials riding. So these new ones are not CNCed and much thicker.
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