Well, that's early in the project but parts are being ordered as I am waiting for the frame to become available in L. This will be my very first built, I have barely touched a bike in 20+ year but that should be the project getting me back into it and first project shared with my son (5yo) who has developed a huge interest for mountain biking.

Here is the component selection so far (in bold what's been ordered, I will add the weight as I receive the parts vs quoted ones), prices is what I paid including shipping, taxes and discounts:
SP-M06 frame - 1050g - $431.91
Syncros Fraser IC SL 740mmx70mm - 270g - $78
Grips, in black no lettering - 26g - $6
Ryet X50 Saddle - 165g - $40
Elitaone seat post - 155g - $24
Toseek bottle cage black - 18g -$9

Zrace X4 silver Brake set - 464g (measured 481g, no mounting hardware) - $73
rotor (180 front and 160 rear) - 241g - $13
front PM 160 to 180 adapter - x - $3.3
Titanium brake rotor bolt kit to get AliExp discount - $8.1
Internal housing noise damper - $3

Crankset with BB92 170mm 32T - 616g (measured 609g, no mounting hardware) - $48
Gub titanium Axis pedals - 225g - $25
Spedao 12S 10-50T Cassette - 375g (measured 380g) - $72
L-TWOO TX 12S Shifter and Derailleur - 414g - $55
YBN 12S chain - 262g - $38

Rockshox Reba RL - 1560g - $220 - used marketplace, like new

Yuan An wheelset 33m width, wing20 spokes, M14 36T ratchet hub - 1290g - $485
Tires SCHWALBE RACING RAY/RALPH 29x2.25 - 1280g - $77




1st time builder tools:
Headset & BB remover - $5.5
Headset & BB install too - $33
brake hose tool - $12
Internal cable routing tool - $4.1
Torque wrench - $17
Brake flushing kit - $11.1
Bike repair stand - $76
Bike basic tool box - $58
Tire sealant injection tool - $1.5



I am going to try and get the data in a table format with quoted weight, actual weight and actual price paid and eventually I will be asking a lot of questions about how to do stuff when the time to get the tools out! wish me luck!

SP M06

You don’t have enough of either to “blend” the paint job rather than having that sortante effect?

It’s juste the pace at which market moves and investors expected returns. It’s quick and easy to get a product that works 95% of the time, let the early adopters be the beta testers. Look at Tesla, and to a certain extent, bmw/VAG/Mercedes, they are not what they used to be in term of dependability because of that forced development pace…

So it is 145mm, and square hole crankset. Off to AliExpress to try and find some 30/32T with 120/130mm cranks (10%of his height according to this http://www.bikesmithdesign.com/Short_Cranks/cranks4kids.html) Crankset is one piece so no choice but replacing cranks too…

Thanks for thorough answer! You have me doubting on crank length, I’ll check that when I get home!

So I got that bike for my son a couple of month ago, great bike at that price
https://www.decathlon.com/products/kids-bike-20-st900?variant=39409795104830

but suffers from the same issues as most of the kids bike:
-rotoshift, but he doesnt have the strength to rotate it (5yo), especially when loading the pedals
-gearing is for kids to mess around in driveway and paved roads, not on the trail

I had him testing mine and my wife bike thumb shifters, and that seems to work for him, so I'll upgrade to shimano TX 30 I think, it seems many people do that. For the chainring, it is currently a 34T I am thinking of changing to 32 or 30 so he can actually use more than the top two sprockets when riding on a trail. I am kind of tempted to move to 30T with shorter crank to gain some ground clearance too (135-140 instead of 145mm).

Anyone's done that and has some feedback?