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Wheel Size
| 27.5" |
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Bike Type
| Cross Country MTB |
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Brake Type
| Disc |
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Telescopic Dropper
| No |
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Material
| Aluminium |
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Electric
| no |
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Frame
| For less weight and more efficient pedalling, the ROCKRIDER ST 900 S 27.5" mountain bike's frame is made from 6061 aluminium (only 2.5 kg in size M, without shock), with a "double butted" front triangle that's 200 g lighter than that of the ST 540 S 27.5".
Its 120 mm rear shock uses a single pivot system (more sensitive to small shocks, while staying firm for big impacts) and sealed bearings for a longer life. |
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Frame Material
| Aluminium |
Size  If you are on a listing page, in this field you will find all the available sizes for that specific product. If you are instead on an ad page, this field reports the Size of the spedific product that is for sale. The Size is one of the most important information for choosing the best fitting product to your body. Wehtere it is a bicycle or gear. Speaking about bike clothing and shoes, sizes follow the international size charts, but when it comes to bicycles and frames it is not possible to define a standard. Bicycles and frames come in many different shapes and geometries and this results in several sizing methods. As a general rule, though, you can assume that road bicycles are sized by the lenght the seat tube in centimeters (52, 54, 56, ...) and mountain bikes are instead sized by the S,M,L, ... rule. Our advice, is to look carefully at the sizing chart you can find in our product pages, but to be sure you are choosing the best fit for you, always refer to your trusted dealer or shop, because he is the one who is the one who can assist you at best for this purpose. | M, L, XL |
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Front Suspension
| The ROCKSHOX 30 SILVER 120 mm AIR shock is 400 g lighter than the one on the ST 540 S mountain bike. Its tapered steerer tube offers even more stiffness and precision when steering.
Easily adjust the fork's bounce and stiffness.
Its quick COMBO LOCK lockout system, which you can control from the handlebar, helps prevent bobbing and loss of speed on faster sections. |
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Front Suspension Travel
| 120 |
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Shock
| This bike has a lightweight 120 mm X-FUSION O2 air shock that has been specially adapted to fit this frame. You can easily adjust it, based on your weight, using its Schrader valve.
A special "high pressure" pump is required to adjust this shock (Rockrider fork and shock pump - ref: 3310286).Its quick COMBO LOCK lockout system, which you can control from the handlebar, helps prevent bobbing and loss of speed on faster sections. |
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Rear Suspension Travel
| 120 |
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Suspension Layout
| Full Suspended |
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Headset
| NA |
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Hub Spacing
| Front: NA;
Rear: NA |
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Wheels
| 27.5 ST 900 S w/23mm tubeless ready rims with 28 spokes |
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Inflation Type
| Tubeless |
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Tyres
| Rockrider All Conditions 27.5”x2.2 |
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Brakeset
| Tektro 180mm front, 160mm rear w/brakelevers Tektro aluminium |
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Shifters
| MICROSHIFT M8515 |
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Rear Derailleur
| MICROSHIFT M665 11-speed |
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Crankset
| SRAM X1000 32-tooth single chainring |
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Bottom Bracket
| NA |
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Cassette
| MICROSHIFT H113 11-cog 11 to 46 teeth |
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Chain
| KMC X11 |
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Pedals
| Rockrider Flat platform |
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Power Meter
| No |
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Saddle
| Rockrider Ergofit Pro |
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Seatpost
| Aluminium Rockrider Sport 31.6 mm diameter 400 mm length |
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Stem
| The all-aluminium Rockrider stem is 70 mm (size S), 80 mm (size M/L), or 90 mm (size XL) and can be raised to 5 adjustment intervals: + 0mm, + 7.5mm, + 15mm, + 22.5mm, + 30mm. |
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Handlebar
| 720mm oversize ROCKRIDER SPORT aluminium |
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Grips
| Rockrider ergonomic |
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Belongs to MY Catalog
| 2022 |