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.042 x .042 x 3mm. Stock replacement ring set for 576555 107" to 124" big bore conversion piston kit
Wiseco
New

Wiseco, piston ring set. 4.250" big bore

#701087

Stock:Yes

Replacement for 3-3/4" bore Twin Cam models that are equipped with the 3-7/8" (3.875") Wiseco pistons used in 95" (1550cc / 4.00" stroke) and 103" (1690cc / 4-3/8" stroke)) engine with Wiseco pistons.
Wiseco
New

Wiseco, piston ring set 3.875" bore

#701345

Stock:No

Std cyl. bore: 3.00" (76.20mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. oil ring: 2.75mm. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 3" bore chromoly piston ring set. +.010"

#507795

Stock:Yes

Replacement forged piston set. Incl. pistons, wrist pins, wristpin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
S&S

S&S, 116" 4" bore piston kit. Std

#916636

Stock:No

Stock replacement for 99-06 Twin Cam 88™ 1450cc models. Std cyl. bore: 3.75" (95.25mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. Oil ring: 3.0mm. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 3-3/4" bore chr/moly piston ring set. +.005"

#915342

Stock:Yes

Comes with parkerized cast gray iron compression and oil rings. Used with early style 1929-1949 type pistons with the one-piece cast iron oil ring. Std cyl. bore: 2.745" (69.72mm). 1st ring: 2.3mm (3/32). 2nd ring: 2.3mm (3/32'). Oil ring: 3.2mm (1/8"). Note: OEM 1950-1973 pistons are equipped with 1/16" (1.6mm) 1st. & 2nd rings and late style 3/16" (4.75mm) 3-piece flex-vent style oil rings for improved oil control, for these Hastings rings see 1950-1973 Flathead model years. Above mentioned rings will not fit the 1950-1973 new type pistons. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 2.745" bore piston ring set. STD

#946144

Stock:Yes

S&S chr/moly replacement piston ring set. Fits all S&S 4" bore Super Sidewinders (incl. TC). Std cyl. bore: 4.00" (101.60mm). Note compression ring gap: To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure, possibly breaking rings and/or damage to pistons and/or cylinder walls, and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or, when rounded of, 0.37mm). Information provided by S&S Cycle, Inc.
S&S

S&S, 4" bore piston rings set. +.030"

#916647

Stock:Yes

Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings. Std cyl. bore: 3.625" (92.075mm). 1st ring: 2.0mm. 2nd ring: 2.0mm. oil ring: 4.75mm. Note: When 3-5/8" S&S pistons are used you should, in practically all cases, use the Hastings rings for S&S pistons that are mentioned as 'S&S 3-5/8 Big Bore'. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 3-5/8" bore chr/moly piston rings. STD

#908555

Stock:Yes

S&S chr/moly replacement piston ring set. Fits all Evolution & pre-Evolution engines that are equipped with an S&S 3-5/8" big bore kit that have 1/16" (1.5mm) compression rings and 5/32" (4.2mm) oil rings. Will also fit other manufacturers 3-5/8" Big Bore kits (like some Axtell kits), that are equipped with the same piston grooves. Std cyl. bore: 3.625" (92.075mm). 1st ring: 1.5mm (.058"). 2nd ring: 1.5mm (.058"). oil ring: 4.2mm (.155"). Note compression ring gap: To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure, possibly breaking rings and/or damage to pistons and/or cylinder walls, and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or, when rounded of, 0.37mm). Information provided by S&S Cycle, Inc.
S&S

S&S, 3-5/8 bore piston rings. +.050"

#908673

Stock:No

S&S chr/moly replacement piston ring set. Fits all S&S 4" bore Super Sidewinders (incl. TC). Std cyl. bore: 4.00" (101.60mm). Note compression ring gap: To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure, possibly breaking rings and/or damage to pistons and/or cylinder walls, and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or, when rounded of, 0.37mm). Information provided by S&S Cycle, Inc.
S&S

S&S, 4" bore piston rings set. +.010"

#916645

Stock:No

Replacement forged piston set. Fits all 100" and 107" 4" bore Super Sidewinder engines. Will also fit the special (out of production) 100" Evo type retro-fit engine for Shovel chassis, which is equipped with small diameter flywheels. Incl. pistons, wrist pins, wristpin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
S&S

S&S, 100"/107" 4" bore piston kit. Std

#916632

Stock:Yes

Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings. Std cyl. bore: 3.625" (92.075mm). 1st ring: 2.0mm. 2nd ring: 2.0mm. oil ring: 4.75mm. Note: When 3-5/8" S&S pistons are used you should, in practically all cases, use the Hastings rings for S&S pistons that are mentioned as 'S&S 3-5/8 Big Bore'. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 3-5/8" bore chr/moly piston rings. +.030"

#908570

Stock:Yes

Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings. Std cyl. bore: 3.625" (92.075mm). 1st ring: 2.0mm. 2nd ring: 2.0mm. oil ring: 4.75mm. Note: When 3-5/8" S&S pistons are used you should, in practically all cases, use the Hastings rings for S&S pistons that are mentioned as 'S&S 3-5/8 Big Bore'. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 3-5/8" bore chr/moly piston rings. +.040"

#908575

Stock:Yes

S&S chr/moly replacement piston ring set. Fits all Evolution & pre-Evolution engines that are equipped with an S&S 3-5/8" big bore kit that have 1/16" (1.5mm) compression rings and 5/32" (4.2mm) oil rings. Will also fit other manufacturers 3-5/8" Big Bore kits (like some Axtell kits), that are equipped with the same piston grooves. Std cyl. bore: 3.625" (92.075mm). 1st ring: 1.5mm (.058"). 2nd ring: 1.5mm (.058"). oil ring: 4.2mm (.155"). Note compression ring gap: To determine the correct ring gap on your newly installed piston rings is very important. A too narrow gap may result in premature piston ring/cylinder wall wear or even seizure, possibly breaking rings and/or damage to pistons and/or cylinder walls, and so on. A piston ring gap that is wider than necessary will result in needless compression loss and reduced engine efficiency. Recommended ring gap is .004" per inch of cylinder diameter for street engines. For a 3-5/8" (3.625") bore engine piston ring gap would be 3.625" x .004" = .0145". (.0145" x 25.4 = 0.3683mm or, when rounded of, 0.37mm). Information provided by S&S Cycle, Inc.
S&S

S&S, 3-5/8 bore piston rings. +.040"

#908672

Stock:Yes

Used with late style 1950-1973 type pistons with 1/16" gray iron parkerized compression rings and the 3-piece flex-vent style chrome oil rings. Also fits 52-56 K, KH, KHK 55" (900cc) Flathead models. Std Bore: 2.745" (69.723mm). 1st ring: 1.6mm. 2nd ring: 1.6mm. oil ring: 4.75mm. Note: OEM 1929-1949 pistons are equipped with 3/32" (2.3mm) 1st. & 2nd rings and 1/8" (3.2mm) oil ring, for these Hastings rings see 1950-1973 Flathead model years. These rings will not fit the 1929-1949 early type pistons. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company, Inc.)
Hastings
Discontinued

Hastings, 2-3/4" bore piston ring set. +.030"

#946455

Stock:Yes

3-5/16" piston ring set with 3/32" (.09375") gray iron parkerized compression and 3/16" (.186") chromed 3-piece oil rings. Fits 37-48 74" (1200cc) 'U' model Flatheads and 48-52 61" (1000cc) E, EL Panhead models. Std bore: 3-5/16" (84.138mm). 1st ring: 2.38mm (3/32"). 2nd ring: 2.38mm (3/32"). oil ring: 4.75mm (3/16"). Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 3-5/16" piston rings. STD

#946470

Stock:Yes

Used with late style 1950-1973 type pistons with 1/16" gray iron parkerized compression rings and the 3-piece flex-vent style chrome oil rings. Also fits 52-56 K, KH, KHK 55" (900cc) Flathead models. Std Bore: 2.745" (69.723mm). 1st ring: 1.6mm. 2nd ring: 1.6mm. oil ring: 4.75mm. Note: OEM 1929-1949 pistons are equipped with 3/32" (2.3mm) 1st. & 2nd rings and 1/8" (3.2mm) oil ring, for these Hastings rings see 1950-1973 Flathead model years. These rings will not fit the 1929-1949 early type pistons. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 2-3/4" bore piston ring set. +.020"

#946454

Stock:Yes

Replacement for 99-06 Twin Cam models that are equipped with the 95" (1550cc) 3-7/8" OEM big bore kit. Also fits 07-17 Twin Cam 103" (1690cc) engine. Std cyl. bore: 3.875" (98.425mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. oil ring: 2.5mm. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 3-7/8" chr/moly piston ring set. +.030"

#915354

Stock:Yes

3-5/16" piston ring set with 3/32" (.09375") gray iron parkerized compression and 3/16" (.186") chromed 3-piece oil rings. Fits 37-48 74" (1200cc) 'U' model Flatheads and 48-52 61" (1000cc) E, EL Panhead models. Std bore: 3-5/16" (84.138mm). 1st ring: 2.38mm (3/32"). 2nd ring: 2.38mm (3/32"). oil ring: 4.75mm (3/16"). Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 3-5/16" piston rings. +.030"

#946473

Stock:Yes

Stock replacement for 99-06 Twin Cam 88™ 1450cc models. Std cyl. bore: 3.75" (95.25mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. Oil ring: 3.0mm. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Information provided by Hastings Manufacturing Company, Inc.)
Hastings

Hastings, 3-3/4" bore chr/moly piston ring set. +.030"

#915345

Stock:Yes