{"id":1762844112,"date":"2025-12-24T10:24:57","date_gmt":"2025-12-24T10:24:57","guid":{"rendered":"https:\/\/www.veloexotique.fr\/?p=1762844112"},"modified":"2026-02-22T21:59:14","modified_gmt":"2026-02-22T21:59:14","slug":"xds-rt9","status":"publish","type":"post","link":"https:\/\/www.veloexotique.fr\/en\/xds-rt9\/","title":{"rendered":"The world's lightest production bike at a discounted price"},"content":{"rendered":"
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The world's lightest production bike at a discounted price<\/h1><\/div><\/div>\n\n

The XDS RT9 is the lightest production road bike and a discounted engineering marvel. The commercially available model simply requires a few upgrades.<\/span><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n

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XDS is releasing a bombshell for the mountain<\/h1><\/div><\/div>\n\n

Sometimes a unique selling proposition does not need to be complicated.<\/span><\/span> <\/span>The XDS RT9 is a WorldTour mountain bike that currently claims the title of the lightest production road bike on the market.<\/span><\/span> <\/span>It achieves this featherweight thanks to aerodynamic wheels and costs thousands of euros less than its closest competitor.<\/span><\/span> I<\/span>It is a model from one of the world's largest manufacturers, but almost unknown in Western markets.<\/span><\/span><\/p>\n

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The XDS RT9 is not perfect in terms of finish, and its final price remains to be determined, but in my experience, it performs just as well as the best ultralight bikes, likely for a much lower price.\u00a0<\/span><\/span><\/span><\/p>\n<\/div><\/div>\n\n

Bike features<\/h1><\/div><\/div>\n\n

\u2022 The frame weighs 550 grams and the fork 300 grams.
<\/span><\/span>\u2022 The weight of the bike ready to ride, without pedals, is 6.1 kg.<\/span><\/span>
\u2022 Threaded BSA bottom bracket
\u2022 Standard round seatpost with external clamp
\u2022 Maximum tire clearance: 32 mm
\u2022 Expect a price reduction of about 4,000 $ compared to the S-Works Aethos 2
\u2022 The RT9 is not focused on aerodynamic performance, but \u00absleek tube junctions and a reduced frontal area inherently contribute to lower aerodynamic drag\u00bb
\u2022 The final model will include a power meter as well as 50 mm aerodynamic-optimized wheels, while meeting the weight targets
\u2022 XDS is one of the largest bicycle manufacturers in the world and X-Lab is a sub-brand of XDS specializing in higher-performance options\u00a0<\/p>\n

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XDS a new challenger in the WORLD tour peloton<\/h1><\/div><\/div>\n\n

Depending on your interest in professional cycling, you may have already seen this bike.<\/span><\/span> <\/span>Even by following it closely, you may have missed it.<\/span><\/span> <\/span><\/p>\n

XDS<\/strong> is the title sponsor of the XDS-Astana team,<\/strong> but the bikes you see do not show it.<\/span><\/span> <\/span>Instead, you spot a large X-Lab logo.<\/span><\/span> <\/span>Furthermore, the framework that generated the most interest is the X-Lab AD9, an aerodynamic bicycle.<\/span><\/span> <\/span><\/span><\/p>\n

Allow me then to begin by introducing you to the XDS (Xidesheng) X-Lab RT9.<\/strong><\/span><\/span> <\/span>XDS is the parent company and, although few people know the name, XDS describes itself as \u00abone of the largest carbon fiber manufacturers in the world and the largest bicycle manufacturing plant in China.\u00bb.<\/span><\/span>\u00a0The second part of this name designates the performance branch of XDS.<\/span><\/span> <\/span><\/p>\n

I prefer to avoid comparing too much with other brands, but we can draw a parallel with Specialized and S-Works.<\/span><\/span> <\/span>XDS offers a wide range of bikes for all types of cyclists, but the high-end bikes usually feature the X-Lab logo.<\/span><\/span> Finally, here is the model RT9<\/strong>.<\/span><\/span> <\/span><\/p>\n

The XDS RT9<\/strong> is the lightest production road bike on the market, with a weight of just 550 grams in size M.<\/span><\/span> <\/span>As with other attempts to win this title, the RT9 relies above all on lightness, effectively neglecting aerodynamics as a design criterion.<\/span><\/span> Despite this similarity, XDS delivered a slightly different narrative from Specialized and Scott regarding their respective bikes in the race for lightness.<\/span><\/span> <\/span>Echoing Specialized's remarks, XDS stated that \u00abthe design philosophy prioritizes structural efficiency through a simplified tube geometry\u00bb and that \u00abthe use of round-section tubes minimizes stress concentrations, thereby allowing for a significantly thinner carbon layup and an overall reduction in material consumption.\u00bb.<\/span><\/span> <\/span><\/p>\n

The brand collaborated with Toray Industries to achieve this feat, and the RT9 frame uses a blend of T1100 carbon fibers, \u00absupplemented by M40X fibers and a small proportion of pitch-based carbon to improve stiffness and vibration damping.\u00bb.<\/span><\/span> <\/span>These materials offer an optimal balance between strength and weight, with the T1100 currently being the best carbon (just another product, subject to progress and new models) that Toray makes available to most manufacturers.<\/span><\/span> <\/span>Then there is the M40X, similar to the T1100, but lighter and stronger.<\/span><\/span><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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What is interesting about Toray's M40X is that it is not widely available for purchase.<\/span><\/span> <\/span>Toray controls access to this material and few brands use it.<\/span><\/span><\/p>\n

<\/span>Pinarello is one of them, and it is found in the Dogma F. And that is not the only exclusive material that makes up this blend.<\/span><\/span> <\/span>You may have noticed the mention of a \u00absmall proportion of pitch-based carbon.\u00bb.<\/span><\/span> <\/span>XDS did not provide further details, but the T1100 and M40X carbons are made of PAN (polyacrylonitrile, a material initially similar to a synthetic textile fiber), whereas pitch-based carbon is manufactured from petroleum pitch or coal tar.<\/span><\/span> <\/span><\/span><\/p>\n

This pitch-based carbon is rigid, yet lightweight and about twice as stiff as the best PAN-based carbon.<\/span><\/span> <\/span>The incorporation of a small amount of this carbon makes it possible to increase rigidity without weighing down the bike, but it is also more effective at dampening vibrations.<\/span><\/span> This carbon is rare because the bicycle industry is competing with aerospace for supplies from a limited number of factories.<\/span><\/span> <\/span>As a result, its price is 10 to 20 times higher, and it is rare, even on high-end bicycles.<\/span><\/span> <\/span><\/p>\n

Factor Bikes is a firm believer in this material, which can be found in particular on the Ostro VAM and O2 VAM models.<\/span><\/span><\/p>\n

The last element revealed by XDS concerned the resin. <\/span><\/span>This technology, known as tow-spreading, makes it possible to reduce the amount of resin required.<\/span><\/span> <\/span>Since the resin is heavy and does not provide strength, it is always better to use less of it.<\/span><\/span> The result? A bike featuring cutting-edge carbon technology, the manufacturing of which requires incredible precision.<\/span><\/span> <\/span>It features frame walls as thin as 0.4 mm in places, for a final weight, as mentioned previously, of 550 \u00b1 15 g.<\/span><\/span> <\/span><\/span><\/span><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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A usable bicycle?\u00a0<\/h1><\/div><\/div>\n\n

But such sophisticated carbon technology and such advanced manufacturing are not measured by driving comfort.<\/span><\/span> <\/span>The bike is light, to be sure, but what about the handling on the bike?<\/span><\/span> <\/span><\/span><\/p>\n

Whatever the final model marketed, this is not the final configuration.<\/span><\/span> <\/span>The price has not yet been announced, and XDS states that the suggested retail price would be less than 10,000 $ and that this model would include a power sensor.<\/span><\/span>\u00a0The groupset I tested is the latest SRAM RED AXS and the frame is compatible with the SRAM UDH standard.<\/span><\/span> <\/span>For the cockpit, I mainly use XDS components with a Selle Italia saddle featuring carbon rails.<\/span><\/span> <\/span>However, the seatpost is not brand-specific;<\/span><\/span> <\/span>The RT9<\/strong> is equipped with an XDS model with a side-clamp seatpost fastening.<\/span><\/span> <\/span>The handlebar and stem form a one-piece unit with internal cable routing in front of the steerer tube.<\/span><\/span> <\/span>The handlebar is round and I use a 37x100 mm, because widths of 37\/38 or 39\/40 cm do not exist with a 110 mm stem.<\/span><\/span> <\/span>The design allows the steerer tube to extend above the stem, which is always practical for finding adjustments early on.<\/span><\/span><\/p>\n

\u00a0The wheels used are the XDS Branta C50 ULR.<\/span><\/span> <\/span>As the name suggests, it is a 50 mm deep aerodynamic wheel with carbon spokes.<\/span><\/span> <\/span>The internal width is 21 mm and the external width is 28 mm.<\/span><\/span> <\/span>The stated weight is 1,250 grams and the tires on my test bike are\u2026<\/span><\/span><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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Discover the other brands on veloexotique.fr<\/h1><\/div><\/div>\n<\/div>\n<\/div>\n\n
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The pros and cons<\/h1><\/div><\/div>\n<\/div>\n<\/div>\n\n
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Product highlights<\/span><\/strong><\/td>\n<\/tr>\n
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Lightweight, only 550g for the frame<\/p>\n<\/td>\n<\/tr>\n

Standardization of peripherals<\/td>\n<\/tr>\n
Low price compared to specs<\/td>\n<\/tr>\n
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The - of the product<\/span><\/strong><\/td>\n<\/tr>\n
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Currently unavailable<\/p>\n<\/td>\n<\/tr>\n

handlebar size<\/td>\n<\/tr>\n
Development not suitable for amateurs<\/td>\n<\/tr>\n
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Test of this bike\u00a0<\/h1><\/div><\/div>\n\n

Rightly or wrongly, I instinctively expect a bike like the XDS RT9 to be flexible and responsive.<\/span><\/span> <\/span>Fortunately, this is rare on a modern bike and the RT9 largely avoids it.<\/span><\/span> <\/span><\/p>\n

In a straight line, no nervousness is felt, unlike certain frames that vibrate and follow the imperfections of the road.<\/span><\/span> <\/span>During my usual test, while riding on the white line at the edge of the road, the bike stayed perfectly straight and I never had any trouble keeping it on track.<\/span><\/span><\/p>\n

In hindsight, I would attribute this stability to the frame technology. <\/span>An oversized down tube connects the head tube and the bottom bracket, and the tubular-structured carbon helps dampen any resonance. <\/span>We feel no twisting and stability is definitely there. <\/span><\/span><\/span><\/p>\n

We also find the expected feel of such a lightweight bike. <\/span>Even with extensive experience with bikes in this category, it still thrills me. <\/span>You can put it on a wheel to move it around the house or take it down the stairs, and its lightness is surprising. <\/span><\/span><\/span><\/p>\n

Around 6 kg ready to go. The wide downtube connects the head tube and the bottom bracket into a single unit. (Photo Josh Ross\/Velo) When climbing, you appreciate the stiffness of the carbon and the downtube, combined with an exceptionally rigid handlebar, as well as the lightness. <\/span><\/span><\/span><\/p>\n

He doesn't make me any faster on the climbs, but he makes me feel like a champion. <\/span>You can shake it back and forth, it doesn't make a sound. The bottom bracket doesn't need to be oversized because it relies on the strength of the down tube. On the other hand, this handlebar... it's the first thing I would change. <\/span>It is excessively rigid and the narrow profile of the round tube did not suit me after prolonged use of the bike. <\/span>Moreover, it is not available in sizes suited to my body type. <\/span><\/span><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n

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Discover the other brands on veloexotique.fr<\/h1><\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n
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The XDS RT9 is the lightest production road bike and a discounted engineering marvel. The commercialized model simply requires a few upgrades.<\/p>","protected":false},"author":1,"featured_media":1762844124,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[8,49],"tags":[],"class_list":["post-1762844112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualite","category-velos"],"acf":[],"yoast_head":"\nLe v\u00e9lo de s\u00e9rie le plus l\u00e9ger au monde \u00e0 prix r\u00e9duit - VeloExotique.fr<\/title>\n<meta name=\"description\" content=\"Le XDS RT9 est le v\u00e9lo de route de s\u00e9rie le plus l\u00e9ger et un bijou d'ing\u00e9nierie \u00e0 prix r\u00e9duit. 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