The RT4100 is a standard-sized fibreglass race seat. We have focused on achieving a lightweight seat shell with optimised geometry, straddling that line between designing the seat to be wide enough in the shoulders to suit the athletic build, but narrow enough to fit in most cockpits. Our patented back-mounted technology has trickled down from the 119 and 129 Series, giving you the option of fixing the seat to the roll cage at shoulder level. Large harness guides and a removable moulded base cushion allow a range of drivers of varying heights to fit. Breathable Spacer fabric, parallel sides and pronounced thigh support round off the features of this accomplished motorsport seat. For the taller driver, the RT4100T uses the WT shell, with additional high-density foam from the sides up to the shoulders. For the larger driver, the RT4100WT is 60mm taller and 40mm wider than the standard seat. The 4100 Series seats use Racetech RTB2009S (steel) or RTB1009M (aluminium) side mounting brackets. Add ons are listed below and need to be added seperatley. Side Brackets - Black Steel Brackets or Alloy Brackets Back Bracket - Alloy Back Bracket or Adjustable Alloy Back Bracket Roll Cage Clamps - 38mm, 41mm or 44mm. Available for pick up from our workshop in Mt Barker SA. If unable to pick up please contact us for a shipping quote. Application Common Applications From clubsport to national-level circuit and rally Stock Colour / Material Gelcoat Gloss Black Seat Cover Black fire-retardant nylon fabric with Spacer mesh through the torso Wear Patches N/A Technical Homologation FIA 8855-1999 Shell Construction Fibreglass Composite Shell Weight From 5.7kg Side Mount Hole Centres 295mm Back Mount Hole Centres 250mm Bolt Torque (Zinc) 30Nm / 22 ft lb Design Sizes StandardT - TallWT - Wide & Tall Head Restraint N/A HANS Compatible Yes Harness Compatibility Up to 6-point harness Large Harness Guides Yes Air Ducting N/A Back-mount Compatible Yes