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Marin B-17 1 27.5+ Mountain Bike 2019 - Trail Full Suspension MTB

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Product Description

The MTB trails are calling you. The Marin B-17 1 is a full sus mountain bike that rolls on plus sized tyres for a smoother ride on rough terrain.

Marin’s Series 4 6061 aluminium frame is lightweight and features MultiTrac suspension for smooth riding on 27.5+ wheels. The RockShox Deluxe R shock controls the 120mm travel to take on rough trails. Boost spacing is found front and rear, with 15x110mm front and 12x148mm rear spacing. This helps add stiffness to the frame and fork, while also allowing for space for the tyres and keeping the chainstays short. Internal cable routing and 29” wheel compatibility finish off this trail bike frame.

RockShox delivers smooth performance with the Recon Gold RL fork. It has 130mm travel with rebound adjustments and a Solo Air Spring, so different riders’ weights can be accounted for without having to change the spring.

The SRAM 1x11 speed NX drivetrain gives plenty of gear range to conquer the mountains, while the Shimano M315 hydraulic disc brakes deliver powerful speed control in all weather conditions.

The wide 2.8” Vee Tyre Crown Gem tyres allow for a greater amount of float on the trails, helping out the suspension travel to create a softer and more controllable ride. A TranzX Dropper post helps to get the seat out the way on the fun stuff going down.

Have a blast in the mountains aboard the Marin B-17 1.

Key Features:

  • Series 4 6061 aluminium frame with MultiTrac Suspension offering 120mm travel from RockShox Deluxe R shock
  • RockShox Recon Gold RL fork offers 130mm travel to control the front end
  • SRAM NX 1x11 speed drivetrain gives wide gearing options
  • Shimano M315 hydraulic disc brakes give power in all weather conditions
  • Wide 2.8” Vee Tyre Crown Gem tyres deliver extra float and control on the trail
  • TranzX Dropper post to make the best of every trail section.
  • Sizes: 15”, 17”, 19”, 20”
  • Colours: Gloss Black
  • The Marin B-17 1 is available with 0% APR finance

The B-17 combines our acclaimed 120mm MultiTrac rear suspension system with 27.5+ tires for an all-day, all-conditions trail bike ready for the unknown. The large volume tires allow for extra low tire pressure and unheard of grip and control in most every condition for an instant confidence boost at speed, and uncanny climbing abilities to conquer the next ridge. At nearly the same outside diameter as 29” tires, 27.5+ tires offer similar roll over capabilities, but with added float and an even larger tire to ground contact patch to help tame the trail.

The B-17 is our most capable MultiTrac bike, built for the all-day trail rider looking for a playful bike with maximum traction. Plus-sized tires are an instant confidence boost and traction upgrade, sticking to most everything and making it possible to climb and descend sketchy parts of trail that may have required hoofing it before.



The B-17 has a Series 3 6061 butted and hydroformed aluminium frame with 120mm travel MultiTrac suspension technology and large volume 27.5+ wheels.

27.5+ WHEELS

27.5+ tires roll fast, grip anything, and their wide high volume low pressure setup brings a new experience to trail riding. The B-17 is compatible with 29” wheels up to 2.5” for two rides in one frame.


MultiTrac is an acclaimed suspension system, fine-tuned to have a balanced ride capable of absorbing big hits with an efficient pedalling platform. The rocker link provides a progressive leverage ratio for the rear shock for small bump sensitivity and the feeling of a long travel system on large drops and rocks.


B-17 models come equipped with internally routed dropper posts, with internal rear derailleur routing for a clean look and snag free ride.


Boost front spacing is paired with a 148x12mm Boost rear thru-axle for frame and wheel strength, and future wheel upgrade compatibility.

    All Tredz bikes are:

    • Fully built & ready to ride
    • Fully checked & tested by Cytech qualified mechanics
    • Available with 0% APR finance on baskets over £99
    • UK price match guarantee
    • 365 day no hassle returns
    • Free delivery in the UK Mainland on a date that suits you

    In the box with every Tredz bike is:

    • Free Tredz 9 key trail tool
    • Free Tredz pedal spanner
    • Free basic pedals
    • Tredz drawstring kit bag
    • 16 point quality control check sheet
    • Basic bike setup instructions
    • Free Cycle Plan insurance voucher (8 weeks)


    Frame:Series 3 6061 Aluminum Frame, 27.5+” Wheels, 120mm Travel MulitTrac Suspension Platform, Seatstay Mounted Post Mount Disc Brake, 148x12mm Thru-Axle **compatible with 29" wheels up to 2.5"
    Fork:RockShox Recon Gold RL 27.5+, 130mm Travel, Compression and Rebound Adjustment, Solo Air Spring, 110x15mm Maxle Stealth, 51mm Offset
    Rear Shock:RockShox Deluxe R Debonair, 210x50mm, Deboinar Air Sleeve, Rebound Adjustment
    Headset:FSA Orbit, Sealed Cartridge Bearings, 1 1/8" x 1 1/2”
    Stem:Marin 3D Forged Alloy
    Bars:Marin Mini-Riser, 6061 Double Butted Aluminum, 15mm rise, 780mm width, 4º up, 9º back
    Front Brake:Shimano BR-M315 Hydraulic Disc, 180mm Rotor
    Rear Brake:Shimano BR-M315 Hydraulic Disc, 180mm Rotor
    Rear Mech:SRAM NX 11-Speed
    Shifters:11 Speed SRAM NX
    Rims:Marin Aluminum Double Wall, 38mm Inner, Pinned Joint, Disc Specific, Tubeless Compatible
    Front Hub:Formula, 110x15mm, Centerlock Disc, 32H
    Rear Hub:Formula, 148x12mm, Quad Sealed Bearings, Centerlock Disc, 32H
    Spokes:14g Black Stainless Steel
    Front Tyre:Vee Tire, Crown Gem 27.5x2.8", Dual Control Compound, Folding Bead, Tubeless Ready Front
    Rear Tyre:Vee Tire, Crown Gem 27.5x2.8", Dual Control Compound, Folding Bead, Tubeless Ready Rear
    Seat Post:TranzX Dropper Post, YSP15 with 1x remote
    Saddle:Marin Speed Concept
    Chainset:FSA Comet, Modular 1x with 30T Direct Mount Chainring, MegaTooth Technology, Boost Spacing
    Bottom Bracket:External Sealed Cartridge Bearings
    Chain:KMC X-11 Extra Light
    Cassette:Sunrace 11-Speed, 11-42T
    Pedals:Not Included

    Occasionally without notice, manufacturers sometimes change product specifications.

    Marin B-17 1 27.5+ Mountain Bike 2019 - Trail Full Suspension MTB Reviews

    Write your own review
    Overall Rating:
    out of 5
    Build Quality
    Value For Money

    Customer Reviews (1)

    Mr Rideout

    Rode my mates b17 absolutely awesum on twisty trails felt like the bike was part of me. Smooth flowing great responsive love it.

    Rode my mates b17 absolutely awesum on twisty trails felt like the bike was part of me. Smooth flowing great responsive love it.

    Close review
    5 out of 5
    Build Quality: 5/5
    Performance: 5/5
    Value For Money: 5/5

    B-17 Sizing

    B-17 Sizing

    See the table below to find the right size Marin B-17.



    4’8” / 143cm








    4’9” / 145cm








    4’10” /  148cm








    4’11” / 150cm








    5’0” / 152cm








    5’1” / 155cm








    5’2” / 158cm








    5’3” / 160cm








    5’4” / 163cm








    5’5” / 165cm








    5’6” / 168cm








    5’7” / 170cm








    5’8” / 173cm








    5’9” / 175cm








    5’10” / 178cm








    5’11” / 180cm








    6’0” / 183cm








    6’1” / 185cm








    6’2” / 188cm








    6’3” / 191cm








    6’4” / 193cm








    6’5” / 196cm








    6’6” / 198cm








    Read our bike size guide for more information on sizing.


    B-17 Geometry






    Stack (mm)





    Reach (mm)





    Head Tube Angle





    Head Tube Length (mm)





    Seat Tube Angle (Virtual)





    Seat Tube Angle (Actual)





    Seat Tube Length (mm)





    Top Tube Actual (mm)





    Top Tube Effective (mm)





    Bottom Bracket Height (mm)





    Bottom Bracket Drop (mm)





    Chain Stay (mm)





    Wheelbase (mm)





    Standover Height (mm)





    Fork Offset





    Seatpost Diameter





    Handlebar Width





    Stem Length





    Crank Length





    Read our Mountain Bike Geometry Explained guide for more information on MTB geometry. 

    Please note, all size information is provided as a guide - if you're unsure or need any further assistance you can call us on 01792 799508 ... we're happy to help!

    Full Sus MTB Guide


    Is a full-suspension mountain bike right for me?

    If you’re new to the world of cycling, we highly recommend taking a look at our bike buying guide overview or our mountain bike buying guide to help you decide what type of bike is right for your needs.

    When you’re choosing a full suspension mountain bike, there are a few things to look out for which can help you to work out the quality and performance you can expect from a particular model.

    Suspension travel & usage

    Depending on the type of mountain bike riding you’ll be doing, you may want to have longer or shorter suspension travel on your bike:





    Up to 120mm


    Lightweight & efficient pedalling for long-distance rides

    Short travel is less capable on rough & demanding trails with large jumps & drops

    120 – 150mm


    Lightweight, balance of climb-friendly efficiency & rough-descent capability

    More weight than a shorter travel bike & less efficient climbing. Less capable on descents than a longer travel bike



    Capable of covering difficult & technical downhill sections. Wide enough gear range for climbing

    Heavier & significantly less efficient at climbing compared to shorter travel bikes

    180mm +


    Designed for highly technical & high-speed descents, with big drops and large jumps

    Heavy, and inefficient at climbing. Limited gear range means most climbs will require pushing the bike

    Frame material

    Full-suspension MTB frames are mostly made from either aluminium or carbon fibre, with each material having its own benefits & drawbacks.


    Aluminium is lightweight, stiff, strong, and easy to manufacture. Manufacturers often develop their own aluminium alloys, such as ALUXX by Giant. Aluminium is found on a wide range of bikes, from entry-level & enthusiast bikes, right the way up to top-spec racing bikes.


    Carbon fibre is lighter, stiffer, stronger, and more expensive than aluminium. The most affordable carbon bikes typically use medium strength carbon fibres, while the most expensive bikes use stronger ‘high modulus’ carbon. Carbon fibre frames are found on enthusiast-level bikes, right up to high-performance bikes designed for racing.

    Groupset & drivetrain

    A bike’s groupset, or drivetrain, is where the biggest difference in component quality is seen.
    A complete groupset comprises of the following parts:

    • Chainset (aka Crankset)
    • Bottom bracket
    • Brakes
    • Brake levers
    • Shifters
    • Front & rear derailleur
    • Chain
    • Cassette
    MTB Groupsets

    Mountain bike groupset components are typically supplied by either Shimano or SRAM, with additional manufacturers like Formula, Hope, Magura, Tektro and TRP supplying brake systems. Shimano & SRAM both produce a range of groupsets to suit different budgets. The hierarchy table here compares the different Shimano & SRAM groupsets to determine which bikes offer the best performance.

    Wheel size

    You’ve probably noticed that a lot of mountain bikes come in a choice of wheel size, mainly a 27.5 inch wheel (also known as a 650B wheel) or a 29inch wheel (known as a 29er). Although there are still bikes which use 26 inch wheels, these are gradually being phased out on all but the smallest bikes. The difference between these wheel sizes can have a dramatic effect on the way a bike feels and handles out on the trail.

    27.5in/650b Wheels

    27.5inch wheels are smaller and lighter than 29er wheels, which makes them more agile and gives the bike a more responsive & playful nature. On the other hand, the smaller wheel size rolls less efficiently than the larger size, making the bike more prone to losing speed over rough ground and making it a little slower when climbing.

    29er Wheels

    29er wheels have a bigger rolling radius which makes them naturally smoother over rough ground. For this reason, a 29er mountain bike often requires less suspension travel than smaller wheeled alternatives. The downsides are an increase in weight, and the larger diameter wheels generate stronger gyroscopic forces, making the bike more stable, but less agile and responsive whilst manoeuvring.

    26in Wheels

    26 inch wheels were once the go-to wheel size on adult mountain bikes. However, they are now typically only found on the smallest frame sizes, and on junior bikes. 26 inch wheels are lightweight and give the bike very agile handling. The downsides to 26 inch wheels are their poor rolling resistance on rough ground, and the reduced contact patch due to the smaller wheel circumference.

    Suspension components

    Mountain bike suspension components (i.e. the fork or rear shock absorber) are also a way to identify the quality of a bike. While Fox and RockShox are the most common manufacturers, there are a number of brands producing suspension components for mountain bikes.

    Entry level full suspension mountain bikes (up to approximately £1300) may come supplied with a fork & rear shock supplied by SR Suntour, X-Fusion or RockShox. These components will allow a limited amount of adjustment, including:

    • Coil spring preload / air spring pressure adjustment
    • Lockout switch
    • Rebound damping adjustment on models towards the top of the price range.

    Mid-range & enthusiast bikes (up to approximately £3500) use components from brands including Fox, RockShox and Manitou. At this level, suspension components have features like:

    • Preload adjustment / air spring pressure adjustment
    • Rebound damping adjustment
    • Lockout switch
    • Multi-position ‘mode’ switch
    • Components towards the top end of the enthusiast price range may also feature compression damping adjustment as well.

    Top of the range & competition spec bikes (over £3500) also use components from Fox, RockShox & Manitou, with a few select models using parts from Ohlins. At this price, suspension components have features including:

    • Coil spring preload adjustment / air spring pressure adjustment
    • High & low speed rebound damping adjustment
    • High & low speed compression damping adjustment
    • Lockout switch
    • Multi-position 'mode' switch
    • Advanced low-friction coatings (e.g. Fox’s golden-coloured Kashima coating)


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    What's In The Box

    What's In The Box

    As cyclists ourselves, we know you will be keen to get out on your new bike as soon as possible. That's why we provide you with all the essential kit you need to get your shiny new bike rolling for the first time.

    Most bikes don't come with pedals as standard so we include a set of basic pedals, free of charge with every bike we send out. We will also provide you with a pedal spanner to fit them and a 9-key trail tool, along with full instructions for setting your bike up out of the box. Each bike is sent out with a 16 point, quality control check sheet so you can be confident that your bike has been fully checked by our qualified mechanics.

    What's in the box
    • Basic setup instructions
    • 16 point quality control checklist
    • Free tredz multitool
    • Free tred pedal spanner
    • Free basic pedals
    • Free drawstring kit bag
    • Free bike insurance voucher

    All these items are provided at no extra charge and are packed into a Tredz drawstring bag that doubles up as a handy backpack for carrying your ride essentials.

    • Basic bike setup instructions
    • Free ‘basic’ pedals
    • Free Tredz pedal spanner
    • Free Tredz 9-key trail tool
    • Free Tredz drawstring bag
    • Free 8 weeks insurance voucher
    • 16 point, quality control check sheet

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    Read our bike setup guide.

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