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

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Product Description

Send it! The Specialized Demo 8 Alloy is a downhill mountain bike that offers dialled DH race performance. Ideal for DH racing the Demo 8 is also a great bike for uplift days and Alpine MTB holidays.

Key Features:

  • M5 aluminium alloy frame with S3 geometry
  • Fox Van RC shock for dependable easy to adjust performance
  • RockShox Boxxer Team fork for coil sprung plushness
  • SRAM GX 1x10 speed drivetrain for reliable gear shifting
  • Colours: Gloss Acid Pink/Black Clean, Satin Black/Cali Fade Clean
  • Sizes: Short, Medium, Long, Extra Long
  • The Specialized Demo 8 Alloy is available with 0% APR finance

When sending it full gas down the run, you want confidence that your bike will perform as it should, and no material has earned its keep on the downhill circuit like our M5 aluminium. The reasons for this are stacking, but primarily, it can all be summed up by stiffness, light overall weight, and strength. That's why you'll find that our Demo 8 I Alloy was constructed from it in order to make your next shred-sesh that much more fun.

It's more than a one-trick-pony, though, as it also features a 1.5-inch forged head tube to enhance most of these qualities. As for the ride, the Demo 8 pairs our S3 Geometry with an asymmetric frame design that ensures plenty of access, 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.

For suspension, this Demo features 200mm up front via a RockShox BoXXer RC 650b and 200mm of travel at the rear controlled by a custom-tuned FOX VAN RC. Together, the combo ensures that you'll be able to rocket over any terrain with confidence.

And when you add in a build kit consisting of SRAM's powerful Guide RS brakes, a durable one-by SRAM drivetrain, and our legendary Butcher & Slaughter DH tires, you get a bike that wants nothing more than to be pushed harder and faster.

M5 alloy construction works in tandem with our S3 Geometry, an asymmetric frame design, and a 1.5” forged head tube to create the ultimate race machine. The design is relatively compact in order increase manoeuvrability and responsiveness, while the 200mm of travel at the rear makes the bike capable of taking on the biggest of hits in stride. And to fill out all of the details that make the difference on race day, we’ve included an ISCG ‘05 mount for chain guides and a rear derailleur protector to keep you shifting smoothly through rock gardens and unexpected strikes.

RockShox BoXXer RC 650b fork is purposefully designed for the most demanding terrain on earth. With 200mm of travel, Motion Control IS damping for maximum efficiency, and Power Buldge reinforced lower legs that allow oversized bushings for incredible stiffness, it'll leave you with nothing but confidence.

The clutched SRAM GX rear derailleur all but eliminates dropped chains, so you're able to rail through rock gardens while still being able to sprint out of them.

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: M5 alloy, S3 Geometry, carbon seatstay, BB30, full internal cable routing, 135mm dropouts, lipped and sealed cartridge bearing pivots, replaceable derailleur hanger, 200mm of travel
Fork: RockShox BoXXer Team 27.5, coil spring, S: Extra soft spring, M: Soft spring, L: Medium spring, XL: Firm spring, 200mm of travel, Charger Damper, compression adjust, rebound adjust, alloy steerer, 48mm offset, Maxle Lite DH
Rear Shock: FOX/Specialized Van RC, rebound & compression adjust, 9.5x3.0"
Stem: Specialized Direct Mount DH Stem, two-piece, forged alloy, 45mm
Bars: Specialized DH, 7050 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 800mm, 31.8mm clamp
Front Brake: SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm rotor
Rear Brake: SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180mm rotor
Rear Mech: SRAM GX, Type 2.1, short cage
Shifters: SRAM X7, trigger
Speed: 10
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: Specialized, sealed cartridge bearings, 12x135mm spacing, 32h
Spokes: DT Swiss Industry, stainless, 3-cross, 2.0"
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: Specialized, 6061 alloy, 2-bolt clamp, 0mm setback, 30.9mm
Chainset: Custom SRAM Descendant, BB30, 7050 alloy arms w/ Gamut bashguard, 165mm
Bottom Bracket: SRAM BB30, 83mm
Chain: SRAM PC-1031, 10-speed w/ PowerLink
Cassette: SRAM PG-1030, 10 speed, 11-36 last three cogs removed
Pedals: Specialized Bennies, 6061 alloy body, sealed cartridge bearings, 4.5mm removable pins

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.

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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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