specialized giant cube cannondale Mavic Castelli endura altura

Ridgeback Dimension 24w 2018 - Junior Bike

Trade & Save £20 off this bike today. Use code SAVE20
or £11.41 / month
Finance Options
Be the first to write a review
Select a colour
Add to Basket

Free insurance Includes 8 weeks Free Bike Insurance. Find out more.

Product Description

Easy riding practicality for younger riders. The Ridgeback Dimension is a junior bike that is ideal for riding everywhere from the local streets and parks to gravel roads. Easy shifting 7-speed gears are combined with powerful V-brakes and fast rolling tyres make the Dimension a perfect all-rounder for boys and girls aged 10 and over.

Key Features:

  • Aluminium alloy frame is lightweight and robust
  • Shimano 1x7 speed drivetrain for reliable gear shifting
  • V-brakes for powerful speed control
  • Fast rolling tyres for efficient cycling
  • Size: 24” wheel
  • Colours: Black, Purple
  • The Ridgeback Dimension is available with 0% APR finance


The Ridgeback Dimension 24 is a lightweight and versatile bike for kids with features specifically designed for smaller riders.

The lightweight triple butted alloy frame at its heart makes the Dimension 24 ideal for small riders who like to ride more often.

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)


Frame: 6061 heat treated aluminium
Fork: Hi ten steel / mudguard eyelets
Headset: Sealed
Stem: Ridgeback quill / 60mm
Bars: Alloy / 560mm width / 30mm rise / 25.4mm barbore
Front Brake: Promax TX-107C V-Brakes
Rear Brake: Promax TX-107C V-Brakes
Brake Lever: Tektro JL-510RS
Rear Mech: Shimano RD-M280
Shifters: Shimano SL-RS45 Revoshift
Speed: 7
Rims: Rigida AS-26 / 32h
Front Hub: Joytech JY-733 32h
Rear Hub: Shimano RM30 32h
Spokes: Stainless steel 14g
Front Tyre: Kenda Kwest 24x1.5
Rear Tyre: Kenda Kwest 24x1.5
Seat Post: Alloy / 27.2x250mm
Chainset: Samox SAC-03 / 36T / 152mm
Bottom Bracket: VP sealed cartridge 68-122.5mm
Chain: KMC UG-51
Cassette: Shimano CS-HG20-7 / 12-32T
Pedals: Resin Junior

Occasionally without notice, manufacturers sometimes change product specifications.

There are currently no customer reviews

Write your own review


Bike Size Calculator

Read our guide to bike sizing

Your mountain bike size is:

Frame (inches): 16/17
Frame (size): Small / Medium

Your road bike size is:

Frame (cm)
Frame (size)

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!

Junior Bikes Guide


Who are junior bikes for?

Junior bikes bridge the gap between kids bikes and adult bikes. With 24” wheels junior bikes are ideal for children who are over 135cm (4’ 4”) tall, which is usually around the age of ten years. Junior bikes are much like scaled down adult bikes with a wide range of gears and powerful brakes. Like adult bikes, junior bikes are available in different styles. Hardtail mountain bikes are most popular, but you can also get full-on road bikes with drop handlebars, relaxed hybrids with baskets on the front and even mini full suspension MTBs. Girls 24” bikes and 24” bikes for boys all feature 24 inch wheels.

Which is the best junior bike for my child?

The best junior bike for your child will depend on what type of cycling they like doing. Most kids at this age will not have settled on a specific cycling discipline, which is why hardtail junior mountain bikes are most popular as they offer all-round performance. Hardtail junior bikes, with flat handlebars, are a great choice for cycling around the local area on roads and cycle paths as well as off-road trails. These bikes are also ideal for Bike Ability cycle training as they are the easiest to ride. If your child is a keen mountain biker or roadie then a junior road bike or higher spec MTB will be a better choice.

If your child is a keen mountain biker or roadie then a junior road bike or higher spec MTB will be a better choice.

What are the things to look for in a junior bike?

Frame and Fork

The best junior bike frames are built from aluminium alloy. This material is lightweight and robust, making it perfect for all types of junior cycles. Steel frames are just as strong as alloy, but are significantly heavier making them harder for youngsters to ride. Rigid forks are best for road cycling with aluminium alloy forks being lighter weight than steel ones. Rigid forks are also good for light off-roading, but a suspension fork will give a smoother ride on rough surfaces. For proper off-road tracks a suspension fork is ideal.

For proper off-road tracks a suspension fork is ideal.

Wheels and Tyres

While all junior bikes have 24 inch wheels, the tyres vary quite a lot and this makes a big difference to how the bikes ride. Generally speaking the narrower a tyre is the faster it will roll, and the wider a tyre is the more grip it will offer. This means that wider tyres are better for off-roading while narrower tyres are better for tarmac cycling.

Common Junior Tyre Sizing Chart

Tyre Width

Best For


Rapid road cycling


General road cycling


Road and off-road cycling

2.1” up

Off-road trails and gravel tracks


Most junior bikes feature derailleur gears to make cycling up and down hills easier. However more gears aren’t necessarily better. Bikes listed as having more than 10 gears usually feature double front chainrings, which many kids find difficult to manage. Single front chainrings with 6, 7, 8 or 9 speed cassettes are easier to use, especially on mountain and hybrid bikes, and still provide plenty of gear options for the climbs. Road bike style junior bikes usually have double chainrings like their adult counterparts. These bikes are ideal for keen young road cyclists who want the performance of an adult bike.

Single front chainrings with 6, 7, 8 or 9 speed cassettes are easier to use.


Like adult bikes, there are two types of brakes on junior bikes. Rim brakes are the most affordable option and offer good stopping control, especially in dry weather conditions. Disc brakes are becoming more popular and offer a big advantage over rim brakes as they work equally well in both wet and dry conditions. Hydraulic disc brakes are the most powerful and are easiest to use.

Rim brakes are the most affordable option and offer good stopping control.

Getting the Right Fit

Once you have chosen the correct size bike using the kids bike size tab information on the product page there are a couple of adjustments that you can make to get the perfect fit for your child.

Saddle Height

If your child is relatively unexperienced, then set the saddle height so that they can put both feet flat on the ground. This will give them the confidence to stop and start whenever they like and reduce the chances of them falling off. Once they are comfortable on the bike you can move the saddle up for a more efficient cycling position. See our saddle height-how to for step by step instructions.

If your child is relatively unexperienced, then set the saddle height so that they can put both feet flat on the ground.

Brake Reach

It is important that your child can reach the brakes easily without having to stretch their hands or unhook their thumb from the handle bars. It’s easy to adjust the reach of the brake levers and move them closer to the handlebars allowing them to brake more easily. Most brake levers have a small screw that moves the brake lever closer to the bars, all you need is a small screwdriver or allen key to do this. Some premium junior bikes even have a tool free reach adjustment nob. You may also need to adjust the brake cable tension with the barrel to get the brakes working optimally for your child.

It is important that your child can reach the brakes easily without having to stretch their hands.

Handlebar Height

While this is less important than saddle height, you can also adjust the handlebar height on junior bikes. This is easily done by repositioning the spacers (on a A-headset) or by loosening the expander bolt and repositioning the stem before retightening (on a quill stem). Start with the stem in its lowest position then move it higher it as they grow to maintain the ideal riding position.

Start with the stem in its lowest position then move it higher it as they grow to maintain the ideal riding position.

Bike Weight

After sizing, weight has the biggest impact on your child’s enjoyment while cycling. To understand why, remember that an adult bike can weigh around 20% of your body weight. Most kid's bikes can weigh up to a hefty 50% of their weight. Imagine strapping concrete blocks to your pedals and start riding, it wouldn’t be a nice experience. Generally speaking, the more you spend on a junior bike, the lighter it will be. This means the bike is easier to handle and manoeuvre, and that translates directly into fun and enjoyment.


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.

Read more about buying on finance

Buy now, pay 12 months later.
Interest free credit with no deposit. Pay nothing for 3 or 6 months on orders over £850, or 12 months on orders over £1,500* *Not available through PayPal Credit

Flexible finance options

Choose your deposit.

Choose your term.

£329.99 Your basket + this product

Lowest monthly cost

£11.41 15.9% APR

per month

for 36 months

Best £0 deposit / 0% interest

£27.50 0% APR

per month

for 12 months

Open Finance Calculator
Representative example: If total purchase price is £1,399.00 with a deposit of £139.90 (10%) and your selected term is 36 months Classic Credit (15.9% APR fixed), you would pay £43.55 per month. Total charge for credit will be £308.70 and total amount repayable is £1567.80, subject to terms and status.

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

Show finance options for:

Available finance options:

Months / APR Per month

Buy now, pay later over £850. Find out more Finance provider options available