Over the past few years the Leicestershire based Sinroja Brothers, Rahul and Birju, have built themselves a reputation as one of the leading lights in the UK custom bike building scene.
Last year we had the pleasure of partnering with them on their exclusive Moksha build for TW Steel, so when they approached us about their latest project we were eager to find out more.
For 2019, the brothers had their hearts set on the ‘Sultans of Sprint’ challenge at the Autodrome de Linas-Montlhery in the south west of France, but needed a manufacturer on board to get involved in the Factory class.
Step forward the team at Royal Enfield, with Industrial Design boss Adrian Sellers putting forward a brand new Continental GT650, although by the time everything was signed off the brothers had just four weeks to complete the build.
Compared to some of the other bikes slated to compete, the Enfield was seriously under powered, so the build had to be as light as possible, although the naked GT650 weighs in at 205kg to start with!
With the help of performance experts S&S Cycles, the brothers set a target weight of 150kg for the bike. The engine was bored out to 750cc, and S&S supplied new injectors, cams and ECU, and a nitrous system was neatly tucked away under the seat to give the bike an extra boost.
All parts from the stripped down bike were weighed as they decided what to ditch, and lighter forks and yokes saved around 10 kilos of weight just on their own. Even the nuts and bolts were swapped for lighter versions to chop another take another 2kg off on the scales.
At the back end, the suspension was ditched in favour of a new hard tail fabricated from Reynolds tubing, and the 18-inch rims were shod with our acclaimed ContiRoadAttack 3 CR rubber which is hugely popular in the classic racing scene. Paying homage to Royal Enfield, the minimal paintwork combines the Indian flag on one side of the tank with the Union Jack on the other.
The bike was the recent gold medal winner at the Wheels & Waves ‘Punks Peak’ hill climb, and it took 4th place in class at the Sultans of Sprint at the end of June.
Judging by this recent video posted by the brothers, we think it may be time for some new tyres….
Or check out the bike in more detail over at Bike Exif.