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Planet X unveils Viner Maxima RS 4.0 with 795g frame

Planet X launches lightest ever Viner carbon frameset

Viner is an Italian bicycle brand that was founded in 1947 by Viviano Nerozzi, but it fell on hard times and a few years ago Planet X acquired the company, and this week it has just launched the Maxima RS 4.0, heralded as its flagship carbon fibre race bike.

The design team for the new bike is based at Planet X’s headquarters in Sheffield, and they have “combined the most up to date frame technologies to produce an ultra light weight frame that retains incredible stiffness.”

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As a result of all that, it’s the lightest frame that has ever worn the Viner logo, with a claimed 795g for a size medium. It’s constructed using high-modulus carbon fibre with internal cable routing and Di2 compatibility. There’s a full carbon fork (392g) with a tapered steerer tube and oversize head tube, and a press fit bottom bracket, all to provide maximum frameset stiffness.

Frames are hand finished in Italy (they’re made in the Far East like most carbon frames these days) and sent to the UK where full bikes are assembled, with two complete bikes on offer. 

The range starts at £1,999.99 with a full Shimano Ultegra 11-speed groupset and Shimano RS330 wheels. A Selcof aluminium handlebar, stem and seatpost finish off the bike, and it comes in at a claimed 7.55kg. 

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Step up to £2.499.99 and you get a Shimano Ultegra Di2 groupset with RS91 C24 wheels, the same Selcof aluminium handlebars and stem but with an FSA SL-K carbon fibre seatpost, changes that bring the claimed weight down to 7.15kg. 

More info at

David worked on the tech team from 2012-2020. Previously he was editor of and before that staff writer at RCUK. He's a seasoned cyclist of all disciplines, from road to mountain biking, touring to cyclo-cross, he only wishes he had time to ride them all. He's mildly competitive, though he'll never admit it, and is a frequent road racer but is too lazy to do really well. He currently resides in the Cotswolds, and you can now find him over on his own YouTube channel David Arthur - Just Ride Bikes

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StraelGuy | 7 years ago

Push fit is weird. My shimano PF30 BB got really creaky at around 2,800 miles. They're cheap as chips so I replaced it and it creaked even more for the next 2 rides but then went silent and has been for the dozen or so rides since .


I won't buy a bike with it again though, it's ridiculous idea aimed at nothing more than saving a couple of bucks of manufacturing time for the makers.

bendertherobot | 7 years ago

Rs91? Are they new?

matthewn5 | 7 years ago


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