Scott launches disc Foil

Scott’s new Foil sets out to prove that disc brakes can en­hance the ride of a full-on aero bike while min­imis­ing the weight penalty

Cycling Weekly - - Contents -

Scott has com­pletely com­mit­ted it­self to disc brak­ing by adding the Scott Foil aero bike to its al­ready es­tab­lished Ad­dict RC disc race bike and Ad­dict range — in­clud­ing the women’s Contessa ranges.

Scott says since other types of rac­ing use disc brakes to en­hance per­for­mance or en­sure lap-by-lap pre­dictabil­ity, power and con­trol, why not bi­cy­cles too? Scott be­lieves discs are the fu­ture and will now of­fer them on all of its bikes.

The new Scott Foil is a com­plete race bike that is not all about aero­dy­nam­ics. It strikes a bal­ance be­tween aero, light­weight, power, con­trol and com­fort.

For the Foil, con­trol is the most im­por­tant of th­ese at­tributes, which is why it has been given disc brakes.

Frame re­work

The first Scott Foil had a special patented pro­file that in­cluded a ‘tran­si­tional ra­dius’ on the trail­ing edge of the tube to help the air flow smoothly. This was de­fined by CFD test­ing, and af­ter 10 dif­fer­ent tests the best per­form­ing were taken into the wind tun­nel. Scott was keen to keep this.

How­ever, disc brakes are not aero­dy­namic, Scott ad­mit­ted — on av­er­age you lose three watts — so Scott wanted to en­sure per­for­mance from disc brak­ing with the same aero per­for­mance of the rim ver­sion. Three watts equate to — ac­cord­ing to Scott’s cal­cu­la­tion — nine sec­onds over 40km at 48kph.

Scott widened the fork to hide the disc caliper be­hind the fork leg. Hav­ing a re­mov­able quick re­lease on the thru-axle saves some more drag. Fairly large fins ex­tend from the front fork too.

The up­shot is that Scott claims that this bike is as aero­dy­namic as its rim­brake ver­sion.

The to­tally new fork is one-piece­moulded car­bon as op­posed to the forks with bonded dropouts that were specced on pre­vi­ous Scotts. This saves a lit­tle bit of weight and adds more strength. It is a lit­tle bit bulkier than the rim-brake ver­sion to han­dle the brak­ing forces of the discs.

The chain­stays are the other dif­fer­ence from the rim-brake ver­sion: they ben­e­fit from beefier tub­ing to han­dle the dif­fer­ent brak­ing stresses, have a slightly dif­fer­ent shape to those of the rim-brake model and are 5mm longer at 410mm.

Ma­te­rial gains

Im­pres­sively, Scott has man­aged to keep the sys­tem weight down: it is just 40 grams heav­ier than its rim-brake sta­ble­mate. The disc fork adds a mere 15g com­pared to the rim-brake fork and the disc-chain­stay frame only adds 25 grams com­pared with the rim ver­sion. This means the to­tal weight for a 56cm frame­set is un­der the 1kg mark at 985 grams.

A top-end build of the new Scott Foil will come in at around 7.2kg for a 56cm frame.

It is claimed that the new bike is as stiff as the pre­vi­ous Foil. Around the BB and head tube it is the same, though due to the bulk­i­ness of the fork, stiff­ness ac­tu­ally in­creases a lit­tle bit up front.

With layup tech­niques and us­ing dif­fer­ent tube shapes — like the slen­der head tube and seat tube — small amounts of flex are en­gi­neered in. The new Foil

also uses the same low­ered rear seat­stay de­sign we now see on all of the BMC and Spe­cial­ized frames to en­sure com­fort and com­pli­ance with­out com­pro­mis­ing other char­ac­ter­is­tics of the frame.

With 28mm tyres — there’s clear­ance for 30mm — you’ll be able to find some com­fort here too.

Tech specs

The new Foil has some nice de­tails through­out the frame­set. It has fol­lowed the usual thru-axle for­mat (100×12mm front 142x12mm rear axle). How­ever, it uses a 1.5mm pitch (stan­dard is 1mm), with more pitch mean­ing fewer turns to re­move the axle for faster wheel changes — a nice idea.

An­other nice touch is the rear wheel guide: both sides of the frame have small grooves to catch the hub ends, help­ing quicker wheel changes dur­ing races.

The new bike will hope­fully be raced — bar­ring UCI stop­pages — by a few rid­ers of Orica-scott at the Tour of Bri­tain.

Aero-foil: canny con­struc­tion has yielded op­ti­mum aero­dy­nam­ics

Disc brakes add a new level of con­trol

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