Jack's Coaching · cycling on YouTube
A $3K bike.Faster than a $16K S‑Works?
Science-based testing, honest AliExpress gear reviews, and the build behind 1M+ views. Scroll to build it.
01 · Frame
TanTan X68.SL8 looks. A fifth of the price.
Open-mould carbon with 105 Di2 12-speed for about $3K. I've raced it, sprinted it, and crashed it.
02 · Wheels
55 to 60 mm carbon.Deep rims, small price.
Princeton-style deep section wheels on Continental GP5000 S TR, 28 front and 30 rear.
03 · Drivetrain
RIRO carbon cranks.165 grams, gone.
Add a ZTTO 11-30 cassette, KMC X12 chain and RYET oversized pulleys. Lighter than Dura-Ace for about $400.
04 · Cockpit + saddle
RYET 3D saddle.Another 50 grams.
One-piece integrated cockpit and the 3D printed saddle that beat three others in my test.
05 · Ride
6.95 kg.Now go ride it.
Every part, every link and every test video is below.
The build
Every part on the 6.95 kg X68
Real weights, the exact listings I bought from. Tap any part to shop it.
Gear I actually use
Tested on camera. Bought with my money.
Cheap doesn't have to mean bad. These are the ones that passed, and the video where I tested each.
For sale
TanTan X68 frameset, 54 cm, black
$800 Melbourne pickup only
A spare X68 frameset, the same frame as my 6.95 kg build. Still wrapped in the factory packaging. Comes with the one-piece integrated carbon cockpit with 38 cm bars. Melbourne buyers only, no shipping.
- TanTan X68 carbon frame + fork, size 54 cm, matte black
- Integrated cockpit: 380 mm bar, 100 mm stem at −6°, 127 mm drop, 75 mm reach
- Disc brake, thru-axle
- See it ridden in the stiffness deep-dive and the 6.95 kg weigh-in
- Pickup in Melbourne, cash or bank transfer on the day
0431 215 460 · or jack@jackscoaching.com
On YouTube
Most watched
Deep dives
Free speed
Aero gains calculator
No new bike, no deeper wheels. Pick your kit and position and see how many watts and minutes each change is worth.
Baseline assumptions
P = ½ ρ CdA v³ + Crr m g v. Baseline is a rider on the hoods in standard kit. Equipment deltas are conservative estimates from published wind tunnel and field testing, your gains depend on fit, position and conditions.
See them tested in 4 aero positions that make you faster.
New tests every month.
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