| Listed in parts books | Not catalogued by year yet |
PISTONS TRI 500 8.5 58-66
Piston for the Triumph 500 twin, 8.5 compression, cataloged for 1958 to 1966.
This is a piston listing for the Triumph 500 twin, cataloged for the 1958 to 1966 span and noted at an 8.5 compression ratio. The piston is the part that rides up and down in the cylinder bore, taking the combustion pressure and driving the connecting rod and crank through the power stroke, so it's a core part of a rebuild if you're going into the top end.
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The part number here doesn't follow the usual Triumph parts-book numbering, so if you're cross-checking against a parts book, look at what your book lists for the 500 twin top end in this era rather than expecting this number to match directly.
We don't have more detail on this one beyond the compression ratio and the year span noted in the catalog entry. If you're rebuilding a 500 twin from this period, give us a call with your bore size and we'll confirm this is the right piston before you order.
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