Doyle:

Website
Doyle J/105 Tuning Guide

North Sails:

Website
North Sails J/105 Tuning Guide
North Sails J/105 Quick TuneCard

Quantum Sails:

Website
Quantum Sails J/105 Tuning Guide
Quantum Sails J/105 Quick Tuning Guide

UK:

Website

Ullman Sails:

Website
Ullman Sails J/105 Tuning Guide
Ullman Sails J/105 Tuning Chart
Ullman Sails J/105 Sailing Guide