British titanium bike brand J.Laverack has launched a disc version of the R J.ACK race bike it developed two years ago, a bike which road.cc awarded a glowing review.
Aside from the adoption of disc brakes, the new R J.ACK Disc will be available in ‘Classic’ and ‘Race’ geometries to suit different riding styles. The former has a taller head tube and shorter top tube for a more upright riding position, the latter is longer and lower for a more aggressive position as befits a race bike.
A closer look at the geometry table reveals a 56cm Race has a 560.1mm stack and 390mm reach, versus 569.9mm and 382mm respectively for the Classic. The Race has a 160mm head tube, while it’s 10mm taller on the Classic. The Race also has a 72.5-degree headangle while the Classic is 1 degree slacker. The 415mm chainstays are the same on both versions but the Classic has a longer wheelbase.
The Rutland-based company has also developed its own carbon fibre fork for the Classic. It has a longer rake (45mm) which is designed to combine with the slacker head angle on this frame to produce calmer steering and more relaxed handling. The Race version of this bike uses a standard Enve Road Disc fork with a 43mm rake.
Both bikes share the same 12mm thru-axles and flat mount disc brakes, as has become standard on most new disc-equipped road bikes. There’s ample clearance for up to 32mm tyres, up from the rim brake versions 28mm max tyre capacity.
Those key changes aside, the rest of the bike is largely the same as the original rim brake R J.ACK. That means a frame made from 3Al/2.5V titanium frame with double butted tubes in the front triangle, a tapered head tube with a Gryphon head badge up front and a threaded bottom bracket. All cable routing is internal.
J.Laverack offers custom options on every frame from a choice of bottom brake types, mudguard and rack mounts and titanium finish, paintwork and even the head badge can be customised. It also offers an in-house bike fitting service to ensure you get the correct fit
“We wanted to translate the proven geometry, speed and agility of the original R J.ACK to a disc brake model in order to a create a spirited and elegant bike for the discerning road rider,” said Oliver Laverack, designer and founder of J.Laverack Bicycles.
The R J.ACK Disc frame costs £1,950, with a fork it’s £2,380, and complete bikes start from £3,650. Check out www.jlaverack.co.uk for more details on the available builds.
road.cc has review bike coming in the next couple of weeks so stay tuned for more information and a closer look at this new bike.
David worked on the road.cc tech team from 2012-2020. Previously he was editor of Bikemagic.com 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.