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SRAM G8 / G9 IGH2015 Frame Fit SpecificationsThis document is intended to communicate general frame fit guidelines for SRAM Internal Gear Hubs.

For additional information, please contact your SRAM representative.

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All dimensions are in millimeters unless otherwise noted.

Images in this document are not to scale.

Your product's appearance may vary slightly from the images in this document.

Information in this document is subject to change without prior notice.

If you have any questions please contact your SRAM representative.

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Table of ContentsSRAM G8 / G9 SHIFTERS .......................................................................................................................................................................................................................................4

G8 / G9 SHIFTERS - GENERAL INFORMATION ...............................................................................................................................................................................................................................................5

G8 / G9 - CABLE HOUSING ...................................................................................................................................................................................................................................................................................6

SRAM G8 IGH ............................................................................................................................................................................................................................................................7G8 - GENERAL INFORMATION .............................................................................................................................................................................................................................................................................8

G8 - COASTER BRAKE ............................................................................................................................................................................................................................................................................................9

G8 - FREE WHEEL ..................................................................................................................................................................................................................................................................................................10

G8 - FREE WHEEL - BELT COMPATIBLE ....................... ....................... ........................ ....................... ........................ ........................ ....................... ........................ ....................... ........................ ................ 11

G8 - DISC BRAKE ..................... ........................ ........................ ....................... ........................ ....................... ........................ ........................ ....................... ........................ ....................... ........................ ........... 12

G8 - DISC BRAKE .................... ........................ ........................ ....................... ........................ ....................... ........................ ........................ ....................... ........................ ....................... ........................ ........... 13

G8 - DISC BRAKE - BELT COMPATIBLE ........................ ....................... ........................ ........................ ....................... ........................ ....................... ........................ ....................... ........................ ............... 14

G8 - DISC BRAKE - BELT COMPATIBLE ........................ ....................... ........................ ........................ ....................... ........................ ....................... ........................ ....................... ........................ ............... 15

SRAM G9 IGH .......................................................................................................................................................................................................................................................... 16G9 - GENERAL INFORMATION ........................ ........................ ....................... ........................ ....................... ........................ ........................ ....................... ........................ ....................... ........................ ....... 17

G9 - DISC BRAKE ...................... ....................... ........................ ....................... ........................ ....................... ........................ ........................ ....................... ........................ ....................... ........................ ........... 18

G9 - DISC BRAKE ...................... ....................... ........................ ....................... ........................ ....................... ........................ ........................ ....................... ........................ ....................... ........................ ........... 19

G9 - DISC BRAKE - BELT COMPATIBLE ........................ ....................... ........................ ....................... ........................ ........................ ....................... ........................ ....................... ........................ .............. 20

G9 - DISC BRAKE - BELT COMPATIBLE ........................ ....................... ........................ ....................... ........................ ........................ ....................... ........................ ....................... ........................ ............... 21

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SRAM G8 / G9 Shifters

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5 SRAM G8 / G9 Shifters

G8 / G9 Shifters - General Information

G8 Twist Shifter G9 Trigger Shifter

Version G8 Twist Shifter (1) G9 Trigger Shifter (1)

Speeds 8 9

Cable LengthVarious lengths available from1500 mm-2100 mm (open system 2300 mm)

1600 mm/ 1700 mm/ 1800 mm (open system 2300 mm)

Shifter Type Twist Shifter Trigger Shifter

Arrangement Right Side of Handlebar Right Side of Handlebar

IGH Compatibility SRAM G8 (1) SRAM G9 (1)

Gear Indication Window Window

Barrel Adjuster Indexing Indexing

Clamping Diameter 22.3 mm 22.3 mm

Cable Routing Continuous Housing (pre-assembled) or Open Continuous Housing (pre-assembled) or Open

Weight 90 g 139 g

Housing Injection Molded Plastic Aluminum

Grip Cover Thermoplastic Elastomer N/A

Color Icelandic Black, Falcon Grey Icelandic Black

(1) There is a special cable configuration for belt compatible hubs, refer to the Cable Housing drawingin this document for more information.

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6 SRAM G8 / G9 Shifters

G8 / G9 - Cable Housing

Model Distance Between Cable Housing End Cap and Screw (mm) Tightening Torque

G8 71.5

3 0.5 Nm (26.6 in-lb)G8 Belt Compatible 90.6

G9 75.8

G9 Belt Compatible 94.9

Distance

< 1 mm

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SRAM G8 IGH

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8 SRAM G8 IGH

G8 - General Information

G8 Coaster Brake G8 Free Wheel G8 Disc Brake

Brake Internal Coaster Brake up to 125 kg (1) No Brake No Brake / Disc Brake Adapter

Speeds 8 8 8

Total Gear Ratio 260% 260% 260%

Gear Steps 12-16% 12-16% 12-16%

Speed 1 60.9% 60.9% 60.9%

Speed 2 71.0% 71.0% 71.0%

Speed 3 80.3% 80.3% 80.3%

Speed 4 90.3% 90.3% 90.3%

Speed 5 105.4% 105.4% 105.4%

Speed 6 120.4% 120.4% 120.4%

Speed 7 135.5% 135.5% 135.5%

Speed 8 158.1% 158.1% 158.1%

Over Locknut Dimension (OLD) 135 mm 135 mm 135 mm

Axle Length 184 mm 184 mm 184 mm

Axle Threads M10x1 (2) M10x1 (2) M10x1 (2)

Dropout Width 4-9 mm 4-9 mm 4-9 mm

No. of Spoke Holes 32 or 36 32 or 36 32 or 36

Spoke Hole Diameter 3 mm 3 mm 3 mm

Spoke Hole Pitch Diamter 101 mm 101 mm 101 mm

Chain Line 49 mm 49 mm 49 mm

Chain Dimensions 1/2" x 1/8" or 1/2" x 3/32" 1/2" x 1/8" or 1/2" x 3/32" 1/2" x 1/8" or 1/2" x 3/32"

Ratio (chain ring/hub sproket) 1.9-2.0 Min. 1.9 Min. 1.9

Hub Sprocket 18 / 19 / 20 / 21 / 22 Teeth 18 / 19 / 20 / 21 / 22 Teeth 18 / 19 / 20 / 21 / 22 Teeth

Shifter SRAM G8 Twist Shifter SRAM G8 Twist Shifter SRAM G8 Twist Shifter

Hub Shell Aluminium Aluminium Aluminium

Color Options Icelandic Black / Falcon Grey Icelandic Black / Falcon Grey Icelandic Black / Falcon Grey

Weight 2188 g 2088 g 2088 g

Belt Version Available No Yes (3) Yes (3)

E-bike Compatibility Please Contact SRAM Please Contact SRAM Please Contact SRAM

(1) Use coaster brake version only for total weight (rider+bike+luggage) up to 125 kg depending on chainring/hub sprocket combination. Coaster brake performance according to DIN EN 14764 approved for125 kg total weight at ratio 1.9.

(2) Refer to the dimension drawings in this document for more information.(3) Special part numbers for hub and shifter required, please contact your SRAM representative.

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9 SRAM G8 IGH

G8 - Coaster Brake

Note

Refer to G8 - Disc Brake drawingfor cable end stop dimensions.

M10x1

101

113 OLD 135

184

3

8.2

100

54

49

40.5 40.5

67.5

3.23.2

24.7

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10 SRAM G8 IGH

G8 - Free Wheel

Note

Refer to G8 - Disc Brake drawingfor cable end stop dimensions.

M10x1

101

113 OLD 135

184

3

54

49

40.5 40.5

67.5

3.23.2

24.7

8.2

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11 SRAM G8 IGH

G8 - Free Wheel - Belt Compatible

Notes

Use with belt pulley 22T and 24T only.The maximum belt width is 11 mm.Refer to G8 - Disc Brake - Belt Compatible drawingfor cable end stop dimensions.

M10x1

101

113 OLD 135

184

3

8.2

54

51

40.5 40.5

67.5

x

2.2+0.1

3.23.2

24.7

(Gates center track)

Flange offset(mount surface)

Belt line depending on belt supplierBelt line = 48.1 + x

Mounting web thickness

Mount surface

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12 SRAM G8 IGH

G8 - Disc Brake

M10x1

44

101

113

OLD 135

184

8.2

3

M5-6H

54

49

9.5

40.5 40.5

67.5

15.3

3.23.2

24.7

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13 SRAM G8 IGH

G8 - Disc Brake

23.1

37.626

5.5

1.75

16.2

93.6

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14 SRAM G8 IGH

G8 - Disc Brake - Belt Compatible

Notes

Use with belt pulley 22T and 24T only.The maximum belt width is 11 mm.

M10x1

44

101

113

OLD 135

184

8.2

3

M5-6H

54

51

9.5

40.5 40.5

67.5

15.3

x

2.2+0.1

3.23.2

24.7

(Gates center track)

Flange offset(mount surface)

Belt line depending on belt supplierbelt line = 48.1 + x

Mounting web thickness

Mount surface

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G8 - Disc Brake - Belt Compatible

Notes

Use with belt pulley 22T and 24T only.The maximum belt width is 11 mm.

15 SRAM G8 IGH

23.3

56.7

26

5.51.4

11.4

93.6

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SRAM G9 IGH

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17 SRAM G9 IGH

G9 - General Information

G9 Coaster Brake G9 Free Wheel G9 Disc Brake

Brake Currently Not Available Use Disc Brake Version No Brake / Disc Brake Adapter

Speeds 9

Total Gear Ratio 292%

Gear Steps 12-16 %

Speed 1 54.1%

Speed 2 60.9%

Speed 3 71.0%

Speed 4 80.3%

Speed 5 90.3%

Speed 6 105.4%

Speed 7 120.4%

Speed 8 135.5%

Speed 9 158.1%

Over Locknut Dimension (OLD) 135 mm

Axle Length 184 mm

Axle Threads M10x1 (1)

Dropout Width 4-9 mm

No. of Spoke Holes 32 or 36

Spoke Hole Diameter 3 mm

Spoke Hole Pitch Diamter 101 mm

Chain Line 49 mm

Chain Dimensions 1/2" x 1/8" or 1/2" x 3/32"

Ratio (chain ring/hub sproket) Min. 1.9

Hub Sprocket 18 / 19 / 20 / 21 / 22 Teeth

Shifter SRAM G9 Trigger Shifter

Shift Mechanism Inside Chain Stay

Hub Shell Aluminium

Color Options Gloss Black

Weight 2088 g

Belt Version Available Yes (2)

E-bike Compatibility Please Contact SRAM

(1) Refer to the dimension drawings in this document for more information.(2) Special part numbers for hub and shifter required, please contact your SRAM representative.

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18 SRAM G9 IGH

G9 - Disc Brake

M10x1

44

101

113

OLD 135

184

8.2

3

M5-6H

54

49

9.5

40.5 40.5

67.5

15.3

3.23.2

24.7

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19 SRAM G9 IGH

G9 - Disc Brake

23.1

37.626

5.5

1.75

16.2

93.6

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20 SRAM G9 IGH

G9 - Disc Brake - Belt Compatible

Notes

Use with belt pulley 22T and 24T only.The maximum belt width is 11 mm.

M10x1

44

101

113

OLD 135

184

8.2

3

M5-6H

54

51

9.5

40.5 40.5

67.5

15.3

x

2.2+0.1

3.23.2

24.7

(Gates center track)

Flange offset(mount surface)

Belt line depending on belt supplierbelt line = 48.1 + x

Mounting web thickness

Mount surface

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G9 - Disc Brake - Belt Compatible

Notes

Use with belt pulley 22T and 24T only.The maximum belt width is 11 mm.

21 SRAM G9 IGH

23.3

56.7

26

5.51.4

11.4

93.6

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GEN.0000000004677 Rev A 2014 SRAM LLC

www.sram.com/service