Pro bike: Katie Compton's Spike Shooter Primus Mootry

Cyclo-crosser rides Old Glory in search of new glory

Katie Compton is enjoying her most successful cyclo-cross season to date. She has worn her US national champion’s jersey – which she won for a fifth successive time this season – on a succession of podiums, including the top step at three World Cup rounds.

As one of the big favourites for this weekend’s UCI World Championships in Hoogerheide, the Netherlands, Compton is hoping to ultimately trade in her stars-and-stripes jersey for her first rainbow one.

The similarly red, (sort of) white and blue Primus Mootry frames that Compton has been using to take on the best riders in Europe this winter are not only the same models that she rode in last season’s campaign, they’re the same frames. According to Compton, she and husband/trainer Mark Legg decided they came out of a tough season of mud and sand in good enough condition to face yet another – a good sign of their durability in contrast to some ‘one season only’ builds.

Primus Mootry principal Joe DePaemelaere has been building the ‘cross star’s custom frames since the autumn of 2005, though the unique multi-material one seen here isn’t in the company catalogue. Compton started out on a full scandium alloy frame but she and DePaemelaere eventually decided that bonding carbon fibre centre sections into the front triangle would add a little more compliance.  

“These are unique frames for Katie. I don’t offer them as a model,” said DePaemelaere. “Katie wanted something a little more comfortable than her previous full-scandium frames. The scandium/carbon frames are actually a few grams heavier than the alloy frames, but the added comfort negates that. Now we are looking to shave the weight on the frame but keep the comfort offered by the carbon.”

The moderately sloping geometry is fairly standard save for a slightly steeper than usual seat tube, which allows the former mountain biker and Paralympic tandem pilot to get over the front of the bike.

Primus Mootry supply Compton with frames but since she isn’t technically a member of the factory team she is able to pick and choose her components based on her own preferences – as well as those who will offer her sponsorship. For this reason, Compton has one of the most eclectic setups in the elite circuit and while the frames are the same as those used last year, virtually everything else is different.

Edge Composites supply the carbon frame tubing but their support extends much further for this season as they also now supply Compton with their new all-carbon ‘cross fork and deep-section carbon tubular wheels. According to Edge, their proprietary net moulding process allows them to make the fork exclusively from carbon all the way to the dropouts for a feathery 450g claimed weight but also impressive durability and an “uncompromising ride quality”.

Edge mould the spoke holes directly into their 68mm-deep carbon tubular rims to eliminate the need for drilling and to preserve fibre strength. On this occasion, Compton had a top-level 1.0 wheel on the front and a slightly heavier – and tougher – 2.0 on the rear, but during many races she uses a 1.0 at both ends.

Both are laced to ultralight, ceramic-equipped DT Swiss 190 hubs with bladed stainless steel spokes held on with a pair of Spin Stix from USE. With a “double start” thread, the British company claims these are quicker and easier to use than cam skewers. With titanium axles they come in at just 55g per pair. Glued to the rims are Challenge Grifo 32 tubulars; the rear one with a standard cotton casing and the front with a smoother rolling and slightly lighter silk one.

The most obvious change from Compton’s setup from last year is the switch she has made from Campagnolo to Shimano Dura-Ace 7900. This latest version of Shimano’s flagship road package is rare even at this elite level of the sport (and that includes the big stars like Sven Nys), though Compton reportedly had to go out and buy her three groupsets with her own money. Possibly because of this, many of the logos on the new components are covered  with tape or a sticker of someone who does pay her to use its products – namely Enduro, who provides their ceramic ZERØ bottom bracket and front and rear derailleur pulleys.

Spinning on those ceramic bearings is the biggest break from that 7900 groupset, namely an SRM power meter based on a Dura-Ace 7800 chainset (SRM hasn’t yet produced a version with 7900 arms). Compton has become one of the many riders who feel that the plethora of useful data that racing with a power meter provides can outweigh the weight penalty.

Other breaks from a complete Shimano ensemble include a gold-coloured KMC X10-SL chain and a pair of Crankbrothers Eggbeater 2ti pedals – the same as she used last season.

Braking duties come courtesy of TRP with its EuroX Mag cantilever brakes – which are actually a claimed 6g per wheel lighter than the carbon ones – and RL950 top-mount levers. Compton fits the magnesium brake arms with longer cartridge pad holders, though, presumably to put more brake block on the rim for surer stopping.  

Compton has long been a devout fan of Deda Newton aluminium handlebars but finally made the switch to carbon this year with her new Zipp SLC2 bars.  In addition to being substantially lighter, Compton feels the “short and shallow” bend is easier to handle while in the drops and the careful construction is seemingly able to withstand the abuse of ‘cross. Holding the bars tight is a Rotor SX stem with a +2.5-degree angle which allows for a shorter steerer tube and virtually no headset spacers atop the Chris King NoThreadset relative to the -10-degree Thomson she used last year.

While Thomson have been replaced at the front of the bike, they have been retained at the rear in the shape of a Masterpiece seatpost. This and the WTB Silverado saddle is one of the few pieces of kit that have been kept from last year’s bike. As saddles are one of the more personal items on a bike, when a rider is happy with a particular shape it’s best not to mess with it.

With its stars and stripes livery and eclectic mix of components, Compton’s bike is one of the most conspicuous out there and there’s no mistaking who it belongs to. If all goes to plan this weekend, Compton may end up riding these frames for yet another season, though a new paint job – with different coloured stripes – might be in order for next season.

Bicycle specifications:

  • Frame: Primus Mootry custom with Edge Composites carbon fibre tubes and scandium lugs and stays
  • Fork: Edge Composites Cross
  • Headset: Chris King NoThreadset
  • Stem: Rotor SX, 120mm x -2.5º
  • Handlebars: Zipp SLC2, Short/Shallow bend, 42cm (c-c)
  • Tape/grips: Zipp
  • Front brake: TRP EuroX Mag
  • Rear brake: TRP EuroX Mag
  • Brake levers: Shimano Dura-Ace STI Dual Control ST-7900
  • Front derailleur: Shimano Dura-Ace FD-7900-F
  • Rear derailleur: Shimano Dura-Ace RD-7900-SS
  • Shift levers: Shimano Dura-Ace STI Dual Control ST-7900
  • Cassette: Shimano Dura-Ace CS-7900, 12-25T
  • Chain: KMC X10-SL
  • Crankset: SRM Wireless Training System Dura-Ace Compact, 175mm, 44/34T Specialities TA Alize chainrings
  • Bottom bracket: Enduro ZERØ Blue
  • Pedals: Crankbrothers Eggbeater 2ti with short titanium axle upgrade
  • Front rim: Edge Composites Tubular 1.0 68mm
  • Rear rim: Edge Composites Tubular 2.0 68mm
  • Front hub: DT Swiss 190
  • Rear hub: DT Swiss 190
  • Spokes: DT Swiss Aerolite
  • Front tyre: Challenge Grifo 32 Seta tubular
  • Rear tyre: Challenge Grifo 32 tubular
  • Saddle: WTB Silverado
  • Seatpost: Thomson Masterpiece

Critical measurements:

  • Rider's height: 1.65m (5ft 5in)
  • Rider's weight: 63.5kg (140lb)
  • Seat tube length, c-c: 478mm
  • Seat tube length, c-t: 520mm
  • Saddle height, from BB (c-t): 687mm
  • Tip of saddle nose to C of bars (next to stem): 462mm
  • C of front wheel to top of bars (next to stem): 615mm
  • Top tube length: 525mm (horizontal)
  • Total bicycle weight: 7.81kg (17.2lb)

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