Allows you to use a 1 inch (25.4mm) threadless stem on a bike with a 1-inch (22.2) threaded steerer.

Profile Design's UCM XL Universal Computer Mount provides a convenient 60mm-long place to mount your computer on your aero bars. It installs without tools, stays put and can be positioned as needed for easily viewing and controlling your computer.

Profile Design's Gap Cap works with 1" or 1 1/8" steer tubes to keep your headset adjusted properly at all times. The composite wedges are a fantastic choice for carbon steerers, and at 30-45 grams, you'll keep the front end of your bike super light.

Fits Profile Design's F-18 through F-22 Series armrests, providing a low profile mount for arm pads. - Construction: 6061-T6 Forged Aluminum - Availability: Two kits to choose from: 31.8mm for flip-up styles or available in 31.8 for non flip-up style. - Weight: 65-70g - Does not include bottom clamp

The new range of extensions have evolved from our well proven T-Series. They have been designed to offer distinct fit options. We have also adopted a new naming system whereby the name gives the angle material of the extension. Thus 35a is a 35° bend in aluminum. Performance - The sole purpose of extensions is to provide a comfortable position for the riders hands relative to the armrests. They enhance performance by allowing the rider to relax into their optimal position. Which is why we provide different fit options so each rider can chase their best performance. Fit Data - Extension Shape: A 35 degree ski-bend extension suited to riders who prefer to adopt a wrist angle that is on the low side of the neutral range. - The 35a is a straight 35° bend. Tech Guide - All the extensions have a 22.2mm diameter in the clamping area. - They are designed for cables to be routed out the rear of the extensions so do not have cable exit holes. Who is it for? - The extensions will fit in any aerobar that is designed for 22.2mm. So can be used by any rider wishing to improve the comfort of their aerobar grips. - Length: 340mm or 400mm - Outer Diameter: 22.2mm - Construction: 6061-T6 aluminum, pre-drilled for bar-end shifter cable routing - Weight: 200g/pair

The new range of extensions have evolved from our well proven T-Series. They have been designed to offer distinct fit options. We have also adopted a new naming system whereby the name gives the angle material of the extension. Thus 45/25c is a 45° / 25° bend in aluminum. Performance - The sole purpose of extensions is to provide a comfortable position for the riders hands relative to the armrests. They enhance performance by allowing the rider to relax into their optimal position. Which is why we provide different fit options so each rider can chase their best performance. Fit Data - The 45/25c extensions have a first section at 45° and the grip at 25°. The rider can choose whether to hold high for the shrugged position or low for a more open, head up position. - The 45/25a offer a 7.5mm lateral shift per side. This allows the rider to get their hands narrower or wider without tilting the extensions so much that the shifters touch. Origin - Recent trends in aerobar fit have been towards higher hand positions, so we've increased the rise compared to previous generation extensions. We have focused on the most popular angles from our previous range and added the 45/25c as a multi position option. Tech Guide - All the extensions have a 22.2mm diameter in the clamping area. - They are designed for cables to be routed out the rear of the extensions so do not have cable exit holes. Who is it for? - The extensions will fit in any aerobar that is designed for 22.2mm. So can be used by any rider wishing to improve the comfort of their aerobar grips. - Length: 400mm - Outer Diameter: 22.2mm - Construction: Carbon - Weight: 242g/pair

The new range of extensions have evolved from our well proven T-Series. They have been designed to offer distinct fit options. We have also adopted a new naming system whereby the name gives the angle material of the extension. Thus 50a is a 50° bend in aluminum. Performance - The sole purpose of extensions is to provide a comfortable position for the riders hands relative to the armrests. They enhance performance by allowing the rider to relax into their optimal position. Which is why we provide different fit options so each rider can chase their best performance. Fit Data - Extension Shape: A 50a extensions offer a 50° ski bend shape. - The 50a offer a 7.5mm lateral shift per side. This allows the rider to get their hands narrower or wider without tilting the extensions so much that the shifters touch. Origin Recent Trends in aerobar fit have been towards higher hand positions, so we've increased the rise compared to previous generation extensions. We have focused on the most popular angles from our previous range and added the 50a as a multi position option. Tech Guide - All the extensions have a 22.2mm diameter in the clamping area. - They are designed for cables to be routed out the rear of the extensions so do not have cable exit holes. Who is it for? - The extensions will fit in any aerobar that is designed for 22.2mm. So can be used by any rider wishing to improve the comfort of their aerobar grips. - Length: 400mm - Outer Diameter: 22.2mm - Construction: 6061-T6 aluminum, pre-drilled for bar-end shifter cable routing - Weight: 200g/pair

The new range of extensions have evolved from our well proven T-Series. They have been designed to offer distinct fit options. We have also adopted a new naming system whereby the name gives the angle material of the extension. Thus 50c is a 50° bend in carbon. Performance - The sole purpose of extensions is to provide a comfortable position for the riders hands relative to the armrests. They enhance performance by allowing the rider to relax into their optimal position. Which is why we provide different fit options so each rider can chase their best performance. Fit Data - Extension Shape: A 50c extensions offer a 50° ski bend shape. - The 50c offer a 7.5mm lateral shift per side. This allows the rider to get their hands narrower or wider without tilting the extensions so much that the shifters touch. Origin - Recent trends in aerobar fit have been towards higher hand positions, so we've increased the rise compared to previous generation extensions. We have focused on the most popular angles from our previous range and added the 50c as a multi position option. Tech Guide - All the extensions have a 22.2mm diameter in the clamping area. - They are designed for cables to be routed out the rear of the extensions so they do not have cable exit holes. Who is it for? - The extensions will fit in any aerobar that is designed for 22.2mm. So can be used by any rider wishing to improve the comfort of their aerobar grips. - Length: 400mm - Outer Diameter: 22.2mm - Construction: Carbon - Weight: 268g/pair

The Aeroport RS910 adaptor offers the capability to tidy up Di2 routing on Tri/TT bikes along with improving access for the adjustment and charging. Performance: The Aeroport RS910 adapter fits the BTR2 internal battery and Aeroport RS910 bar end junction into the rear of a set of aluminum series extensions or 35c+ extension.This makes battery placement and cable routing through the frame easier and more secure. As well as avoiding the need for an unsightly mess of cables as typically seen with an EW junction box, or the inconvenience of hiding the junction box in the stem or frame. Compatibility: The adapter is only compatible with 22.2mm OD aluminum series extensions or a 35c+ carbon extension at this stage, with an ID of 19.4mm - Construction: Injected nylon/glass fiber - Clamp Compatibility: 22.2mm OD / 19.4mm ID - Extension Compatibility: 35a, 45/25a, 50a, 35c+ - It is designed to fit the following Di2 parts: RS910 Junction box, BTR2 Internal battery, SD50 cables - Di2 parts are not included with the adapter. - Note that the adapter will not fit in an aerobar like the Profile Design Aeria Evo as the rear of the extension is not accessible

Profile Design's lightweight and sleek looking headset spacers are just what you need to make sure your bike functions and looks great. Available in 2, 3, 5, 10, and 20mm thicknesses.

The Race and Ergo Ultra pads allow riders to tune their setups for a snug fit. - New foam that resists being crushed for longer periods of time - Improved surface durability - Superior grip with a molded-in textured surface - Compatible with both the Ergo and Race armrest kits - Dimensions: Race (92.9mm x 887.5mm) or Ergo (108.4mm x 87.5mm) - Compatibility: Race / Ergo - Weight: 5mm: 21g / 10mm: 37g

Profile Design's F-19 Replacement Pads are the correct ones for their F-19 armrests. These pads feature Lycra-covered medium-durometer foam and are held on with Velcro backing.

Flip-up armrest leaving the base or drop bar clear for riding with your hands on the flat section of the handlebar. - Construction: 6061-T6 Forged Aluminum - Stack Height: 24mm - Width Adjustment: 37mm - Clamp Diameter: 31.8mm (26.0 w/Shims) - Weight: 242g

The Race is, as the name suggests, oriented towards holding the rider in a narrow, speed focused position. It offers a tight radius curve intended to very closely clasp the elbows - providing good control and helping the rider to stay in a tight position. The bolt pattern yields 32 possible configurations just by moving the armrest. The Race is compatible with all current aerobars and earlier models that used the F19, F22 or F35 armrests. - Armrest Construction: Injected Nylon/Glass Fiber - Pad Construction: EVA foam with anti-bacterial/anti-microbial Lycra cover - Pad Model: 5mm - Hardware: M6 x 10 FHB - Weight: 145g/pair

The forged aluminum bracket offers solid, easy-to-use construction alongside an industry-leading fit range. It is also compatible with our riser kits. The bracket is designed for 31.8mm bars and 22.2mm extensions in aluminum or carbon. - Materials: Forged 6061-T6 AL - Stack Height: 42.6mm - Width Adjustment: 37mm - Basebar Clamp Diameter: 31.8mm - Extension Clamp Diameter: 22.2mm - Weight: 234g

The Sonic/Ergo/45AR aerobar offers comprehensive yet simple adjustments, ideally suited to riders wishing to add aerobars to their road, gravel, or bikepacking bike. The Sonic/Ergo platform offers a large range of adjustments in every dimension, enabling riders to optimize the comfort of their positions. This bar can be used for draft-legal triathlon once shortened to meet the ITU Rules. - Clamp Diameter: 31.8mm (26.0 w/Shims) - Armrest: Ergo Ultra / 10mm Pads - Armrest Width: 124mm to 290mm in 18.5mm steps (with Extensions at 100mm) - Armrest Offset: -70mm to -17.5mm in 7.5mm steps - Armrest Stack: The minimum is 60mm and the bracket is compatible with our existing risers which add up to 130mm stack with (70mm of spacers added) - Extension Width: 100mm - Weight: 545g

The bracket is forged to create a sleek low stack design. It offers significantly lower stack than the rest of the Sonic range while retaining the extension reach and width adjustment options. It is compatible with a 31.8mm basebar, our riser kits, and 22.2mm extensions in aluminum and carbon. - Materials: Forged 6061-T6 AL - Stack Height: 23.5mm - Width Adjustment: 37mm - Basebar Clamp Diameter: 31.8mm - Extension Clamp Diameter: 22.2mm - Weight: 352g

Profile Design's UCM Universal Computer Mount provides a convenient 25mm long place to mount your computer on your aero bars. It installs without tools, stays put and can be positioned as needed for easily viewing and controlling your computer.

Profile Design’s Venturi Arm Rest Kit is the correct model for your Profile Design Century Aerobars (sold separately). The foam arm pads have adhesive backing and the kit includes all necessary hardware.