FairWheelBikesExpert review
6.5/10
Asks if the RT9 is the world's lightest frame; weighs stock components, results described as surprising at a good price.
Read the reviewRT9
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RT9
Est. tax $658.80 for 43215 (US average) · Shipping set by X-LAB at checkout
| Drivetrain | Shimano Dura Ace Di2 (RD/R9250/FD/R9250/ST/R9270/BR/R9200) |
|---|---|
| Crankset | Branta carbon with integrated power meter |
| Wheelset | Branta C50 ULR carbon rims with carbon spokes |
| Tires | Michelin Pro 5 700x28c |
| Frame Material | Toray T1100 and M40X carbon fiber |
| Frame Weight | 6.20 kg (13.64 lbs) at size L |
What these specs mean
Shimano road groupsets
- Claris
- Sora
- Tiagra
- 105
- Ultegra
- Dura-AceThis one
12-speed Di2. Pro race level; light and expensive
A groupset is the shifters, derailleurs, brakes, crankset and cassette. Higher tiers are lighter, shift more crisply and have more gears; most riders stop noticing a difference above 105.
- Di2
- Shimano’s electronic shifting: a small motor moves the chain at the press of a button. Crisper shifts and no cable stretch; you charge it every few hundred miles, and it usually adds several hundred dollars.
About this item
- Engineered as the lightest production carbon road bike frame, delivering unmatched weight savings without compromising structural integrity.
- Advanced Toray T1100 and M40X carbon fiber construction for extreme weight reduction and strength
- Shadowbox frame design enhances speed, efficiency, and precision on the road
- Shimano Dura Ace Di2 drivetrain enables instant, precise shifting for competitive racing
- Branta C50 ULR carbon wheelset with carbon spokes provides exceptional stiffness and aerodynamic efficiency
- Integrated Apple Find My technology adds modern anti-theft security
Why it scores 6.1: Mixed, from 3 sources. Early estimate: more sources will firm it up. See the breakdown
How it scores
Mixed · likely 5.1 to 7.0 · low confidence
From 3 expert reviews.
Your score
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Quick picks:
By what matters
Ride comfortnot enough reviews yet–
Speed & weightnot enough reviews yet–
Componentsnot enough reviews yet–
Tire room & versatilitynot enough reviews yet–
Reliabilitynot enough reviews yet–
Value for moneyprice against similar products5.2
By source
Video reviews3 sources · 75% of the score6.0
Out of 10. Each source is weighted by how reliable it is, how much data it has and how recent it is; sponsored videos count half, and the brand’s own videos don’t count. How the score works
Reviews and videos
FairWheelBikesExpert review
6.0/10
Shop build of a lightweight RT9 using featherlight aftermarket parts; shows a weight-focused build, no drawbacks stated.
Read the reviewCADE MediaExpert reviewSponsored by the brand
4.5/10
First look at the X-LAB RT9 'world's lightest bike'; reviewer says 'close, but no cigar.'
Read the reviewSources we checked
- Shopify Global Catalogchecked, nothing yet
- Hacker Newschecked, nothing yet
- Redditnot connected yet
- YouTube reviews6 found
- Xnot connected yet
- Expert reviews (web)not connected yet
- Browsing agent (computer use)not connected yet
Compare with similar items
| This itemRT9 |  AD9 |  Tarmac SL9 S-Level SRAM RED AXS | |
|---|---|---|---|
| Customer rating | |||
| Price | $9,150.00 | $7,999.00 Lowest price | $10,499.99 |
| Doorprice Score | 6.1Doorprice Score | 7.5Doorprice Score Best score | 6.7Doorprice Score |
| Sold by | X-LAB | X-LAB | Strictly Bicycles |
| See details | See details | See details |
Product description
The lightest production road frame ever built.
From the seller’s listing.