
Shimano CS-M5100 Cassette 11 Speed, 11-51T
11-51T
Velopedia Bicycle Archive
Original specifications: 27.5; 29 wheels · 12.67kg (27 lb, 14.9 oz) published weight · geometry for 8 published sizes.
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At a glance
| Frame Construction | Specialized A1 premium butted alloy, zero-stack head tube, internal cable routing, 135x9mm forged dropouts, chainstay-mounted disc brake, replaceable alloy derailleur hanger, stealth rack mounts, dropper post compatible |
|---|---|
| Frame Material | Aluminum |
| Fork | RockShox Judy, Solo Air, Turnkey damper, 46mm offset, QR, 80/90/100mm travel (size-specific), alloy steerer |
| Fork Material | Aluminum |
| Shifters | Shimano Deore M5100, 11-speed |
|---|---|
| Rear Derailleur | Shimano Deore M5100, SGS, 11-speed |
| Crankset | Stout 1x, forged alloy |
| Bottom Bracket | Square-tapered, 73mm, internal bearings, 122.5mm spindle |
| BB Shell Width | 73 mm |
| Cassette | Shimano Deore, 11spd, 11-51t |
| Chain | Shimano CN-LG500, W/QUICK-LINK |
| Brakes | (F) Shimano BR-MT200, hydraulic disc, 160,180mm / (R) Shimano BR-MT200, hydraulic disc, 160mm |
|---|
| Handlebar | Stout Mini Rise, alloy, 9-degree backsweep, 15mm rise, 31.8mm |
|---|---|
| Stem | Stout 3D-forged alloy, 31.8mm, 6-degree rise |
| Saddle | Bridge Sport, Steel rails, 155/143mm |
| Seatpost | Alloy, 2-bolt clamp, 30.9mm |
| Hubs | (F) Formula DC-20, 6-Bolt, disc, 100x9mm spacing, quick-release / (R) Formula DC-22, 6-Bolt freehub, disc, 135x9mm spacing, quick-release |
|---|---|
| Rims | Specialized Alloy, hookless, Tubeless ready, 25mm inner width |
| Spokes | Stainless, 14g |
| Front Tire | Ground Control 2BR, 650B/29x2.35, T5 |
| Rear Tire | Ground Control 2BR, 650B/29x2.35, T5 |
| Wheel Size | 27.5; 29 |
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
| Measurement | XS - 27.5 | S - 27.5 | M - 27.5 | S - 29 | M - 29 | L - 29 | XL - 29 | XXL - 29 |
|---|---|---|---|---|---|---|---|---|
| Seat tube | 310 mm | 350 mm | 360 mm | 400 mm | 400 mm | 450 mm | 500 mm | 560 mm |
| Effective top tube | 541 mm | 565 mm | 586 mm | 589 mm | 608 mm | 630 mm | 654 mm | 679 mm |
| Head tube | 95 mm | 100 mm | 95 mm | 105 mm | 95 mm | 105 mm | 120 mm | 135 mm |
| Head-tube angle | 68° | 68° | 68.5° | 68° | 68.5° | 68.5° | 68.5° | 68.5° |
| Seat-tube angle | 73.5° | 73.5° | 73.5° | 73.5° | 73.5° | 73.5° | 73.5° | 73.5° |
| Chainstay / rear center | 440 mm | 440 mm | 440 mm | 440 mm | 440 mm | 440 mm | 440 mm | 440 mm |
| Wheelbase | 1067 mm | 1092 mm | 1105 mm | 1118 mm | 1128 mm | 1152 mm | 1178 mm | 1203 mm |
| Bottom-bracket drop | 43 mm | 43 mm | 62 mm | 43 mm | 62 mm | 62 mm | 62 mm | 62 mm |
| Bottom-bracket height | 310 mm | 310 mm | 310 mm | 310 mm | 310 mm | 310 mm | 310 mm | 310 mm |
| Reach | 375 mm | 395 mm | 405 mm | 415 mm | 425 mm | 445 mm | 465 mm | 485 mm |
| Stack | 559 mm | 573 mm | 607 mm | 589 mm | 616 mm | 626 mm | 640 mm | 654 mm |
| Standover height | 658 mm | 695 mm | 732 mm | 735 mm | 754 mm | 781 mm | 820 mm | 853 mm |
| Fork offset / rake | 42 mm | 42 mm | 46 mm | 42 mm | 46 mm | 46 mm | 46 mm | 46 mm |
| Front center | 630 mm | 656 mm | 672 mm | 682 mm | 696 mm | 719 mm | 745 mm | 770 mm |
| Trail | 97 mm | 97 mm | 97 mm | 97 mm | 97 mm | 97 mm | 97 mm | 97 mm |
| Fork length / axle-to-crown | 475 mm | 485 mm | 505 mm | 495 mm | 515 mm | 515 mm | 515 mm | 515 mm |
| Seatpost length | 300 mm | 350 mm | 400 mm | 350 mm | 400 mm | 400 mm | 400 mm | 400 mm |
| Crank length | 165 mm | 170 mm | 170 mm | 170 mm | 170 mm | 170 mm | 175 mm | 175 mm |
| Stem length | 35 mm | 45 mm | 60 mm | 45 mm | 60 mm | 60 mm | 70 mm | 70 mm |
| Handlebar width | 700 mm | 720 mm | 740 mm | 720 mm | 740 mm | 740 mm | 740 mm | 740 mm |
| Wheel size | 27.5in | 27.5in | 29in | 27.5in | 29in | 29in | 29in | 29in |
Dimensions as recorded.
Parts & serviceability

11-51T

10/11 Speed

30.9x400mm
Replacement option · verify fit
Based on the original build. Confirm the model, size and fit before ordering; installed parts may differ. As an Amazon Associate I earn from qualifying purchases. Velopedia may also earn from qualifying eBay purchases. Velopedia may also earn from qualifying retailer purchases.
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Archived: 2024 Specialized Rockhopper Expert · Mountain · Published sizes: XS, S, M, L, XL, XXL
Archived: Frame: Specialized A1 premium butted alloy, zero-stack head tube, internal cable routing, 135x9mm forged dropouts, chainstay-mounted disc brake, replaceable alloy derailleur hanger, stealth rack mounts, dropper post compatible · Fork: RockShox Judy, Solo Air, Turnkey damper, 46mm offset, QR, 80/90/100mm travel (size-specific), alloy steerer · Aluminum
Archived: Fork: RockShox Judy, Solo Air, Turnkey damper, 46mm offset, QR, 80/90/100mm travel (size-specific), alloy steerer
Archived: Shifters: Shimano Deore M5100, 11-speed · Rear derailleur: Shimano Deore M5100, SGS, 11-speed · Crankset: Stout 1x, forged alloy · Bottom bracket: Square-tapered, 73mm, internal bearings, 122.5mm spindle · Cassette: Shimano Deore, 11spd, 11-51t · Chain: Shimano CN-LG500, W/QUICK-LINK
Archived: Brakes: (F) Shimano BR-MT200, hydraulic disc, 160,180mm / (R) Shimano BR-MT200, hydraulic disc, 160mm
Archived: Wheel size: 27.5; 29 · Rims: Specialized Alloy, hookless, Tubeless ready, 25mm inner width · Hubs: (F) Formula DC-20, 6-Bolt, disc, 100x9mm spacing, quick-release / (R) Formula DC-22, 6-Bolt freehub, disc, 135x9mm spacing, quick-release · Front tire: Ground Control 2BR, 650B/29x2.35, T5 · Rear tire: Ground Control 2BR, 650B/29x2.35, T5
Archived: Handlebar: Stout Mini Rise, alloy, 9-degree backsweep, 15mm rise, 31.8mm · Stem: Stout 3D-forged alloy, 31.8mm, 6-degree rise · Seatpost: Alloy, 2-bolt clamp, 30.9mm · Saddle: Bridge Sport, Steel rails, 155/143mm
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.