Very comfortable race bike with sorted geometry and an impressive spec list – apart from the tyres
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For those sections on the ride between the descents or the climbs, I found I could just tap out the power and keep spinning along with minimal fatigue. There is still vibration from the road, but it is muted enough that it doesn't tire out any of your contact points. If you like to ride centuries or partake in sportives but still want to go fast, this is the kind of bike you are going to want.
I've ridden hundreds of carbon fibre frames over the last 15 or so years and I can tell this is one that has been designed to offer very precise levels of stiffness and comfort throughout, something you don't get from an off-the-shelf, out-of-a-catalogue frame. We have the medium frame here, which is one of six sizes available. The top tube length is 557mm while the seat tube is 505mm.
Braking-wise, the Sum uses a 160mm rotor on the front and a 140mm on the rear, which I think is ample for road use, especially on a race bike. Some brands spec 160mm on the rear too, but I'm not sure you need it. The seatpost is carbon fibre and specific to the Sum's frame, and while an upgrade isn't possible, you won't need to anyway. I had no slippage issues with it at all, and could detect a small amount of flex for a bit of added comfort.
Wrapped around the L42s are a pair of Vittoria Rubino Pro Control tyres, although the spec list says Vittoria Rubino TLR G2.0s.and thought they were very good for long distance riders who are more concerned with longevity than overall top speed. Argon 18 says,"Own the season: the Sum will get you ahead on the climbs, keep you there on the flats, and power you through the sprints."Where does this model sit in the range? Tell us briefly about the cheaper options and the more expensive options
A fast and direct front end makes this a great bike to ride at speed. It's not twitchy or a handful to ride, though.
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