Renthal – Renthal Chain Links & Tools, including R1 spring links in 415, 420 and 428, R3-3 off-road spring links, R3-3 520 rivet links, and R4 and R4-2 rivet links, is the small-parts shelf that decides whether a chain install is trustworthy. Spring links are the fast, serviceable option for racers who split a chain regularly, with R1 spring links in 415 including a gold finish, plus 420 and 428 sizes for minis and small-bore machines, and an R3-3 off-road spring link for sealed-ring off-road chains. Rivet links are the permanent choice where load and speed are higher, covering R3-3 520, R4 520, R4 520 for ATV use, and R4-2 530 applications. Matching the link to the exact chain series and pitch is not optional: a link intended for a different plate thickness or ring pack will bind, wear unevenly, or fail under load, and a failed link takes cases and swingarms with it. Correct hardware also keeps the sealed-ring system intact so the chain holds lubrication and adjustment across a full season. Keeping the right master link on the bench means a worn chain gets replaced properly rather than nursed along, which protects sprockets and keeps power delivery smooth.