This ‘lefty’ aero road bike is just the tip of an insane Italian iceberg

Jemm bikes makes ‘carbotanium’, honeycomb kevlar frames and more

Have you heard of Jemm (or J-emm) bikes? Yeah, me neither. This Italian custom brand is doing some truly mad things with bikes, including this astonishing 1× aero road bike with a custom ‘lefty’-style rigid fork.

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We spotted this bizarre machine, called the Gravel 5.5 HC, at this year’s Bike Place show, and it’s just one of the strange and wonderful things Jemm makes.

Does this make sense? Does it matter? We love it
Does this make sense? Does it matter? We love it
Jack Luke / Immediate Media

Alongside relatively conventional custom carbon bikes, Jemm builds frames using ‘carbotanium’, a carbon-titanium weave as used in the construction of supercars like the Pagani Zonda.

The Unica.5 is a striking aero machine that uses 'carbotanium' in its construction
The Unica.5 is a striking aero machine
Matthew Allen / Immediate Media

The motorsports connection is not an accident — Jemm is based in the Emilia Romagna region’s so-called Motor Valley, a stone’s throw from the headquarters of manufacturers including Ferrari, Ducati and yes, Pagani.

Carbotanium is, as the name implies, a carbon-titanium weave
Carbotanium is, as the name implies, a carbon-titanium weave
Jemm Bikes

According to Jemm’s Jon Iriberri, carbotanium offers some of the advantages of carbon — albeit at an increased weight — with the ride quality of titanium.

All of Jemm’s frames are built in house, and the weirdness doesn’t stop at metal-carbon composites. Jemm also builds frames using a kevlar honeycomb, which purports to offer superior vibration absorption to conventional carbon, at a similar weight.

Jemm offers honeycomb kevlar construction as an alternative to conventional carbon
Jemm offers honeycomb kevlar construction as an alternative to conventional carbon
Jemm bikes

Jemm’s bikes are all custom, so you can mix and match frame designs, materials and paintjobs to your heart’s content.

On that last point, the Jemm colour palette tends towards the lairy and Euro. The brand even makes mountain bikes, ones with a distinctly Euro flavour.

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If you’re interested in the brand, its website can be found here. Make sure you click through the gallery above for more pictures of these unusual machines.