PRO Missile Alloy S-Bend Extensions review

The PRO Missile Alloy S-Bend Extensions are at the premium end of aluminium clip-on aerobars, both in terms of price and features. 

Total weight for the set including clamps and bolts is 17oz / 484g, a little less than most clip-ons around this price point. 

PRO claims the S-bend Missile bars “allow for an extremely aerodynamic position”, designed for flexible riders who want to get low with a 30-degree upsweeping angle where your hands grip the extensions. 

Triathlon bike fitting has generally moved towards more elevated hand positions in recent years.

So if this feels more comfortable for you and/or your bike fitter recommends it, PRO also sells the Missile with ski-bend (45-degree upsweep) and J-bend extensions (65-degree upsweep). 

Fitting the PRO Missile Alloy S-Bend Extensions

Whichever option you choose, all Missile extensions are roughly 13.5oz / 344mm in length and have a diameter of 0.87oz / 22.2mm. 

A 3mm Allen key is needed to attach the bracket to your base bar, which is compatible with standard 31.8mm bars. PRO offers a spacer kit to increase stack, which I could only find at one online retailer priced at £89.99. 

This significant expense, plus lack of availability, means I think these bars are best used with no rise on a road bike, which is how I used them for my testing. 

If you do want them for a dedicated triathlon bike, the bar ends are removable for routing gears through. 

The bracket and pads offer multiple positions for resting your forearms. When you’ve set them up and tightened the extensions (there’s a scale for dialling in your ideal length), it’s simply a case of sticking the 1cm- thick covers over the pads. 

Performance and comfort

The pads on the Missile clip-ons are slightly raised at the sides, which cradled my forearms very nicely. 

This helped with locking my position in for extended periods on the aerobars, great for middle- and long-distance triathlons. 

The pad covers are wide and thick, which reduced vibrations from the road and kept me comfortable for the duration of my rides. 

The extensions themselves provide strong, reliable contact points for resting your hands. I personally prefer ski-bend or J-bend bars, but the S-bend is great if you prefer a flatter hand position. 

For sprint and standard tri distances, gripping onto the raw alloy is fine, but I’d recommend bar tape for longer distances. 

Bottom line

Overall, I enjoyed using the Missile Alloy bars, and would recommend them to anyone looking for a mid-range, reasonably lightweight set of clip-ons for their road bike. 

To complement your racing set-up, pick one of the best aero helmets for triathlon training and racing.

PRO Missile Alloy S-Bend Extensions spec

Price	$209.99 / £140
Weight	17oz / 484g
Shape	S-bend
Length	13.5in / 344mm
Features	31.8mm bar clamp, soft arm pads, multi-position width arm pads, adjustable bracket