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I can't find a weight for the Racelight 4S Disc - do you know how it compares with the Aiethien? What's the £100 price difference get you on the Aithein? Lighter?
If you visit its website and choose the "Geometry" tab, at the bottom of each size there is the frame weight, the fork is 450gr in their site, but mine weights 440gr uncuted. My 63cm frame is 1,790kg "naked", although the chart claims 1,72kg.
My actual build is about 9,3kg with mid-range components
For what I know comparing Aithein to 4S, they advertise the first more for racing because of geometry and lightweight, and the 4S has more comfort in the rear triangle. Or at least that's what their seatstays claim:
The Aithein is also cleaner (no mudguard/rack mounts in the frame or fork), but as I said it has no hole in the fork to put the Supernova Triple where the rim brake caliper whould go (I assume you will be using some kind of handlebar bag, I'm not but don't like to have a hot light near my garmin). The 4S Disc is pretty good for just 757€ (£487), more money to get wheels and gears.
I don't have 32mm tyres to test it on my frame, but I assume there is still enough room on both fork and chainstays (0,5mm with 28mm tyres).
PS: Kinesis UK usually answers my questions via direct message quite fast and effectively
bertocq-
So, there's only 150-200g difference in frame weight between the models at the ~53cm size. Not sure what that will equate to at my 56/57cm size but it won't be all that much. Mudguard eyes are useful back in the UK when it's not being raced so the 4S wins on that front. It also wins on tyre clearance.
The 4S has Flat Mount disc mounts vs. Post Mounts. That's not going to make any difference I don't think. The 4S is cheaper and I already own the rim brake version of the 4S so I'm happy enough with the design already :)
Looks like the 4S has #1 spot.
Question then is, what bits do I then need for it?
Are these BR-785 units (http://www.bike-discount.de/en/buy/shimano-ultegra-di2-6870-st-r785-hydraulic-electric-kit-internal-internal-401953) Flat Mount and suitable for this frame? "It is best recommended that you run a 140mm rear rotor." say Kinesis. Ok!
I'll have a chat with my partner in grime tonight and see what the go is with ordering one.
hippy
I run 28mm now on the Kinesis 4S and I would like to go bigger. 2 weeks of smashing into potholes takes its toll on undercarriage AND sanity so I'm quite prepared to sacrifice some speed for comfort.
I can't find a weight for the Racelight 4S Disc - do you know how it compares with the Aiethien? What's the £100 price difference get you on the Aithein? Lighter?
I guess the tyre limiter on my 4S is actually the brake calipers, not the frame. I never tried >28s as they were already pretty damn close to the fork. Get a bit more clearance with discs.
Good call.
I might have a word with Bike Whisperer since they sorted my last two Kinesis frames out. Dunno if they're still in contact with the dealer(s) though.