Go wild 11.7:1 or go mild 10.5:1 forged.
Stock are cast alloy 8.5:1
US $407.00
Approximately AU $572.96 or
Au$700 delivered now after postage, 10% GST on item and postage, then add currency conversion fees to Australia.
Crazy- they have taken the compression ratio details off sometime when relisting.
These are the 11.7:1
Triumph Rocket 3 III JE Piston Kit Standard Bore 317210 | eBay
These are the 10.5:1
Triumph Rocket 3 III JE Piston Kit Standard Bore 317209 | eBay
I got a 10.5:1 set of them a year or two ago. Stiil in the box but getting closer.

TRIUMPH - 2004-2013 Rocket 3 - JE Pistons
2004-2013 Rocket 3
Std Bore: 101.6mm
Piston Kit #
Disp.
Bore Size
Over Size
Comp Ratio
Gram Wt (g) Skirt
Style
Ring #
Pin #
Lock #
Gasket #
Sleeve #
317209 2249cc 101.6mm STD
10.5:1 361 FSR
JG3101-4000-7 866-2250-15-51C 866-063-MW Call
317210 2249cc 101.6mm STD
11.7:1 385 FSR
JG3101-4000-7 866-2250-15-51C 866-063-MW Call M