Decide your starting point:
For a first-time builder, a used 600cc supersport donor is best. trackdayr construir 11139936 full
Trackdayr is a relatively niche, European-focused brand (with strong distribution in Spain and Italy) aimed at sport and track-day riders. The name itself—"Trackdayr"—clearly signals its target audience: riders who want track-ready protection and aerodynamics without paying premium racing brand prices. Decide your starting point:
The Construir 11139936 Full is one of their mid-to-high tier full-face helmets. The model number "11139936" typically refers to a specific graphic/color variant (often a matte black/red or carbon-look finish, depending on the batch). "Full" indicates it’s a full-face design with full racing specifications. For a first-time builder, a used 600cc supersport
Positioning: Competes with the likes of LS2, MT Helmets, Scorpion EXO, and lower-end AGV or HJC models.
Set rider sag (30-40 mm front, 25-35 mm rear). Install a fork revalve kit if not replacing internals. For a “full” build, fit Öhlins or K-Tech cartridges.
Look for cracks, especially near swingarm pivot and steering head. Weld reinforcement plates if needed. For code 11139936, this might be the process step where you apply a specific torque sequence — check your parts list.