Forge - Ultegra

The Forge is built for riders who want genuine road-bike pace without giving up all-day comfort. Its geometry comes from thousands of real Pearson bike fits, so it stays fast and composed over long rides, sportives and big weekends.

The Forge frame uses a blend of T800 and M40JB Toray carbon fibre. T800 is a high-strength carbon that gives the frame its durability and impact resistance. M40JB adds high-modulus rigidity in specific areas, increasing stiffness at the bottom bracket and head tube for efficient power transfer. The result is a frame that is fast and stiff without being harsh over long distances.

The Forge frame weighs 732g. The fork weighs 400g. Combined frameset weight is approximately 1132g. Both figures are measured at size 3.

Weight depends on the build. Measured at size 3: SRAM RED AXS 7.19kg, Shimano Dura-Ace Di2 7.32kg, SRAM Force AXS 7.59kg, Shimano Ultegra Di2 7.62kg and Shimano 105 Di2 8.01kg.

The Forge takes tyres up to 35mm. Every complete build comes on 32mm Vittoria Corsa tyres: Corsa N.EXT on the 105, Ultegra and Force builds, and tan wall Corsa Pro Control on the Dura-Ace and RED builds. Clearance is set for road and light gravel rather than wider off-road tyres.

Yes. The ERE wheels on every complete Forge build are tubeless ready, with tubeless tape fitted. Builds ship with inner tubes. To convert, you need tubeless valves, sealant and tubeless-ready tyres.

The Forge uses a threaded T47 bottom bracket. The Dura-Ace, RED and Force builds come with a CeramicSpeed T47, and the Ultegra and 105 builds with a Hope T47. T47 is durable, easy to service and works with both Shimano and SRAM cranks.

Five builds: Shimano 105 Di2, Shimano Ultegra Di2, Shimano Dura-Ace Di2, SRAM Force AXS and SRAM RED AXS. All five are electronic 12-speed groupsets. For a frameset build, the T47 bottom bracket and cable routing work with a broad range of Shimano and SRAM road groupsets.

The 105 build has ERE Tenaci GX23 alloy wheels. The Ultegra and Force builds have ERE Genus II CL45 carbon wheels, and the Dura-Ace and RED builds have ERE Genus II CL45-R wheels with carbon spokes. All are tubeless ready. With the frameset, the wheels are your choice.

The Forge uses performance endurance geometry across five sizes (1 to 5), developed from data gathered over 2,000 professional bike fits collected across 13 years. The geometry is shaped for an inclusive riding position: a shorter reach and slightly taller front end make the Forge accessible to a broad range of rider proportions, including those who need comfort over long distances without sacrificing performance.

The full geometry chart is on this page, under Geometry. We recommend using professional bike fit data to determine your correct size. If you have not had a fit, contact us on 020 3828 7696 or email [email protected] and we will talk you through the options before you order.

Yes. The Forge has hidden mudguard mounts at the fork crown and under the chainstay bridge, keeping the frame lines clean while allowing mudguards to be fitted for winter or wet-weather use. The Forge also has three bottle cage bosses: two on the down tube and one on the seat tube.

The Forge is certified to ISO 4210 safety standard. It is not UCI approved. For road sportives, gran fondos, and non-sanctioned events this makes no practical difference. If you are competing in UCI-sanctioned road races where UCI equipment approval is mandatory, the Shift 2.0 is our UCI-approved road model.

The Forge uses a T47 shell with a 68mm width. For Shimano cranks (24mm spindle): any T47 68mm bottom bracket in that spindle diameter. Hope T47 is a well-supported option that threads cleanly and services easily. CeramicSpeed T47 is what we fit to the Dura-Ace, RED and Force builds. For SRAM DUB cranks, use a T47 bottom bracket made for the DUB spindle.

If you are building the frameset with a groupset not listed in the standard complete bike options, contact us on 020 3828 7696 or email [email protected] and we can confirm compatibility before you order.

The Forge uses two hanger configurations depending on the groupset fitted. Shimano builds use a standard bolt-on hanger. SRAM builds use a direct mount dropout. Both types are available to order through Pearson: email [email protected] with your frame number and we will confirm the correct part. A spare hanger is included in the welcome pack with every complete bike.

The Forge comes with a Pearson-branded stem, seatpost, and handlebar. These are designed by Pearson but they are not proprietary parts. The steerer is a standard diameter, so any compatible aftermarket bar and stem will fit if you want to change them. Pearson replacement parts for the branded components are also available directly from us.

The one part that must be ordered through Pearson is the rear derailleur hanger. Hangers are model-specific and are not available through general bike shops. Email [email protected] with your frame number and we will sort a replacement.

The Forge uses M12 x 1 thread, 122mm at the front and M12 x 1, 166mm at the rear. The same specification applies to the Shift 2.0 and On&On Adventure. A replacement thru-axle set (front and rear) is available directly from Pearson for £20, and it covers all three models.

The On&On Race has a UDH (Universal Derailleur Hanger) dropout, so contact us to confirm the right rear axle before you order one.