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Specialized S-Works Demo 8 27.5" Mountain Bike 2018 - Downhill Full Suspension MTB

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Product Description

Push your limits further. The Specialized S-Works Demo 8 is a downhill mountain bike that has cut its teeth on the very toughest DH tracks in the world. The S-Works Demo 8 is a DH bike that is built for raw speed in a game where every second counts.

Key Features:

  • Fact 11m carbon front triangle with full carbon rear and Team alloy rocker link
  • Custom Öhlins TTX shock offers outstanding damping characteristics
  • RockShox Boxxer World Cup fork for hard hitting speed
  • SRAM XO1 DH 1x7 speed drivetrain is built for DH
  • Colours: Gloss Blue Tint Carbon/Mint/Black
  • Sizes: Short, Medium, Long, Extra Long
  • The Specialized S-Works Demo 8 is available with 0% APR finance

Relentless, fast, aggressive—no matter how you describe it, downhill racing is demanding. Starting with the bike, you're inserting control into a borderline uncontrollable situation wherever you can. But when it comes to harnessing gravity's pull, while also maintaining confident handling, it simply doesn't get any better than the S-Work Demo 8.

It's constructed from our finest carbon fibre, FACT 11m, for unparalleled stiffness and strength. At the front, you'll find 200mm of travel coming through a custom-tuned RockShox BoXXer Team 650b fork, and at the rear, you get 200mm of travel via our Öhlins TTX rear shock.

It's also been built off of our S3 650b geometry, ensuring a roomy top tube for added control, ultra-short, nimble chainstays, a low bottom bracket that keeps you feeling planted, and a slack front end that provides the utmost in responsive handling at speed.

The build is also dialled-in, sparing absolutely no expense in providing the utmost in lightweight, durable performance. This means that you get powerful SRAM Code RSC brakes and 200/180mm Centerline rotors, a precise one-by X01 DH seven-speed drivetrain, strong & stiff Roval 650b wheels, and our legendary Butcher & Slaughter DH tires for the ultimate in traction and control.

Add it all up, and you get everything you need to send-it down the mountain with more speed than you ever thought possible.

The frame features a full FACT 11m carbon fibre construction for low weight and heightened levels of strength and stiffness, which is amplified by its asymmetrical frame design that still leaves plenty of access. This has also been paired with our proven S3 Geometry that increases manoeuvrability and responsiveness, while the 200mm of travel at the rear makes the bike capable of taking on the biggest of hits in stride.

RockShox BoXXer Team 650b fork is nothing short of legendary. With 200mm of travel, a Charger Damper for maximum efficiency, and Power Buldge reinforced lower legs that allow oversized bushings for incredible stiffness, it's easy to see why it's such a fan favourite for gravity fiends.

A SRAM X01 DH 7-speed rear derailleur makes sure that your chain stays put on the cassette, and keeps all of your power taking you forward, no matter how gnarly the terrain.

All Tredz bikes are:

  • Fully built & ready to ride
  • Fully checked & tested by Cytech qualified mechanics
  • Available with 0% APR finance (up to 48 months) on any basket 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)

Specification

Frame:S-Works FACT 11m, S3 Geometry, carbon front triangle, full carbon rear end, new team alloy link, FACT IS construction, BB30, full internal cable routing, 135mm dropouts, lipped and sealed cartridge bearing pivots, replaceable derailleur
Fork:RockShox BoXXer WC 27.5, Charger Damper, air spring, compression adjust, rebound adjust, alloy steerer, 48mm offset, Maxle Lite DH, 200mm of travel
Rear Shock:Custom Öhlins TTX, Twin-Tube design, high- and low-speed compression adjust, rebound adjust, 9.5x3"
Stem:Specialized Direct Mount DH Stem, two-piece, forged alloy, 45mm
Bars:Specialized DH, FACT carbon, 6-degree upsweep, 8-degree backsweep, 27mm rise, 800mm, 31.8mm
Front Brake:SRAM Code RSC, 4-piston caliper, hydraulic disc, metallic pads, 200mm rotor
Rear Brake:SRAM Code RSC, 4-piston caliper, hydraulic disc, metallic pads, 180mm rotor
Rear Mech:SRAM X01 DH, short cage, 7-speed
Shifters:SRAM X0 DH, 7-speed, trigger
Speed:7
Rims:Roval 27.5, alloy, 24mm internal width
Front Hub:Specialized disc, alloy flange & disc mount, sealed cartridge bearings, 20mm thru-axle, 32h
Rear Hub:Custom DT Swiss 350, 135mm spacing, SRAM XD driver, 54T ratchet, 12mm thru-axle, 32h
Spokes:DT Swiss Competition, stainless, black,x2.0x1.8x2.0
Front Tyre:Butcher, DH casing, 27.5 b x2.5", 60 TPI, wire bead
Rear Tyre:Butcher, DH casing, 27.5 b x2.3", 60 TPI, wire bead
Seat Post:Thomson, alloy, straight, 12-degree clamp
Chainset:SRAM X0 DH, carbon, 104 BCD spider, 165mm crankarm w/ Gamut bashguard
Bottom Bracket:SRAM BB30, 83mm
Chain:SRAM PC1130 chain, 11-speed w/ PowerLink
Cassette:SRAM X01 DH, 7-speed, 10-24t
Pedals:Specialized Boomslang, 6061 alloy, sealed cartridge bearings

Occasionally without notice, manufacturers sometimes change product specifications.

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Demo 8 Sizing

Specialized Demo Sizing

Height

Size

5’0” / 152cm 

M    

5’2” / 158cm

M

 

 

5’3” / 160cm

M

 

 

5’4” / 163cm

M

 

 

5’5” / 165cm

M

 

 

5’6” / 168cm

M

 

 

5’7” / 170cm

 

L

 

5’8” / 173cm

 

L

 

5’9” / 175cm

 

L

 

5’10” / 178cm

 

L

 

5’11” /180cm

 

L

 

6’0” / 183cm

 

L

 

6’1” / 185cm

 

 

XL

6’2” / 188cm

 

 

XL

6’3” / 191cm

 

 

XL

6’4” / 193cm

 

 

XL

6’5” / 196cm

 

 

Xl

6’6” / 198cm

 

 

XL

6’7” / 201cm

 

 

XL

6’8” / 203cm

 

 

XL

6’9” / 205cm

 

 

XL

See the table below to find the right size Specialized Demo.Read our bike size guide for more information on sizing.

Demo 8 Geometry

 

Short

Medium

Long

X Long

Crank length

165mm

165mm

165mm

165mm

Stem length

45mm

45mm

45mm

45mm

Seatpost length

367mm

367mm

367mm

367mm

Saddle width

143mm

143mm

143mm

143mm

Handlebar width

800mm

800mm

800mm

800mm

Reach

395mm

420mm

440mm

460mm

Top tube length, horizontal

571mm

596mm

616mm

636mm

Stack

614mm

614mm

614mm

614mm

Wheelbase

1183mm

1208mm

1228mm

1248mm

Chainstay length

430mm

430mm

430mm

430mm

Front center

754mm

779mm

799mm

819mm

Bb drop

12mm

12mm

12mm

12mm

Bb height

342mm

342mm

342mm

342mm

Seat tube angle

74°

74°

74°

74°

Head tube angle

63.5°

63.5°

63.5°

63.5°

Seat tube length

367mm

367mm

367mm

367mm

Head tube length

105mm

105mm

105mm

105mm

Bike standover height

698mm

698mm

698mm

698mm

Fork rake/offset

52mm

52mm

52mm

52mm

Fork length, full

590mm

590mm

590mm

590mm

Trail

118mm

118mm

118mm

118mm

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:

Travel

Usage

Pros

Cons

Up to 120mm

XC

Lightweight & efficient pedalling for long-distance rides

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

120 – 150mm

Trail

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

150-180mm

Enduro

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 +

Downhill

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

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

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)

Finance

How do I apply for finance?

Spend £99 or more at Tredz and you can spread the cost. Pay monthly over 6-48 months, interest free (dependent on repayment terms and amount).

1Fill your basket with everything you want from Tredz and go to the checkout.

2During checkout, select the finance option you want as your method of payment.

3You will be sent to our finance provider's secure server to complete your application.

4Finance providers PayPal & V12 will use the information provided to make a decision and complete checkout if you are approved.

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Delivery & Guarantee

UK Delivery Information

We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE to mainland UK, regardless of the size and on all orders over £20.

Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.

Please note that Pre-Order dates can sometimes change due to updated stock information.

Click here for more UK and international delivery information.

Returns & Warranty

It's easy to return a product with our 365 day, hassle free returns.

We will give you a full refund or exchange on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.

If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

For more information please visit our Returns & Warranty page.

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

Tredz Service:

Tredz bikes are fully built & set up to ride
Read our bike setup guide.

Free UK delivery, on a date that suits you
We will ring to choose a suitable day. Find out more
  • Tredz bikes are fully checked & tested by Cytech qualified mechanics
  • 0% APR finance available on any basket over £99
  • Price match guarantee
  • 365 day 'no hassle' returns
  • Free UK delivery, on a date that suits you

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