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The GT Aggressor Expert is the perfect step up for anyone looking to take their trail riding to the next level, offering a blend of durability, performance, and versatility. Here’s why it should be your next mountain bike.
The GT Aggressor Expert is the perfect step up for anyone looking to take their trail riding to the next level, offering a blend of durability, performance, and versatility. Here’s why it should be your next mountain bike.
GT

GT Aggressor 27.5 Expert Mountain Bike Silver - Medium

£399.99 £550.00 27% off
Size Guide
Pre-Order

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined

Cycle King Store Returns Policy

📄 Download Returns PDF

🛒 1. Online Returns Policy Online Orders

If you’d like to return an item purchased online, the process is quick and simple.

Tell Us First

  • Email sales@cycleking.co.uk within 14 days of receiving your order.
  • Include your name, order number and the item(s) you wish to return.

Send the Item Back

You then have a further 14 days to return the item to:

Cycle King Online Returns
Professional Place, Hodgson Way
Wickford, SS11 8YX
Phone: 01268 574040

We recommend using a tracked service and retaining your proof of postage.

Return Conditions

Items must be:

  • Unused and in original packaging
  • Complete with all parts and accessories

We cannot accept:

  • Used items
  • Worn/installed parts
  • Personalised or special-order items (unless faulty)

Refunds

  • Processed within 5–10 working days of receipt
  • Postage costs are non-refundable unless the item is faulty or incorrect

Faulty or Damaged Items

Email us with photos/videos and we’ll resolve the issue quickly.
This does not affect your statutory rights.

Exchanges

Please follow the returns steps above and place a new order for the replacement.

🏬 2. In-Store Returns Policy In Store

If you purchased your item in one of our stores, we’re happy to help if something isn’t right.

Returning an Item to Store

You can return your purchase to any Cycle King branch. Please bring:

  • The item in unused, original condition
  • Proof of purchase (receipt, gift receipt, or bank statement)

Timeframe

  • Refunds available within 14 days of purchase
  • After 14 days, an exchange or store credit may be offered at the manager’s discretion

Return Conditions

Items must be:

  • Unused and in original packaging
  • Complete with all parts and accessories

We cannot accept:

  • Used items
  • Worn/installed parts
  • Personalised or special-order items (unless faulty)

Refunds

Refunds are issued back to the original payment method:

  • Card refunds must go back to the same card used
  • Finance purchases follow V12 terms
  • Gift voucher purchases are refunded as gift vouchers

Faulty or Damaged Items

Bring the item back with proof of purchase and our team will assess the fault.

Depending on the issue and age of the product, we will repair, replace, or refund as appropriate.
This does not affect your statutory rights.

Exchanges

Where suitable, we can offer an exchange or store credit under the return conditions above.

Returns Policies (UK)

Information on online and in-store returns, exchanges and refunds.

💻 Online Returns – How do I start a return? Online

Email sales@cycleking.co.uk within 14 days of receiving your order.
Include your name, order number and the item(s) you wish to return.

📦 Where do I send my return? Address

Cycle King Online Returns
Professional Place, Hodgson Way
Wickford, SS11 8YX

You then have a further 14 days to return the item. We recommend using a tracked service and keeping proof of postage.

✅ What are the online return conditions? Conditions

Items must be:

  • Unused and in their original packaging
  • Complete with all parts and accessories

We cannot accept returns of:

  • Used items
  • Worn/installed parts
  • Personalised or special-order items (unless faulty)
💷 When will I receive my refund? Refunds

Refunds are processed within 5–10 working days of receiving the returned item.
Return postage is the customer’s responsibility unless the item is faulty or incorrect.

⚠️ What if my item is faulty or damaged? Faulty

Email us with clear photos/videos and we will resolve this quickly.
This does not affect your statutory rights.

🔄 Can I exchange an online order? Exchange

Yes — return the item as normal and place a new order for the replacement.

In-Store Returns Policy

Return or exchange items at any Cycle King branch, subject to the conditions below.

🏬 Can I return an in-store purchase? In-Store

You can return unused spares and accessories to any Cycle King branch.

Please bring:

  • Unused item in its original condition
  • Proof of purchase (receipt, gift receipt or bank statement)

Bikes: Once ordered, built and collected, bikes can only be exchanged if unused.

🕒 What is the in-store returns timeframe? Timescales
  • Refunds and exchanges available within 14 days of purchase
  • After 14 days, a store credit may be offered at the manager’s discretion
📑 What are the in-store return conditions? Conditions

Items must be:

  • Unused and in original packaging
  • Complete with all parts and accessories

We cannot accept:

  • Used items
  • Worn or installed parts
  • Personalised or special-order items (unless faulty)
💳 How are refunds issued in-store? Refunds
  • Refunds go back to the original payment method
  • Card refunds must be issued to the same card used
  • Finance purchases follow V12 Finance terms
  • Gift voucher purchases are refunded as gift vouchers
🛠️ What happens with faulty or damaged items? Faulty

Please return the item with proof of purchase.
Our team will assess and repair, replace or refund where appropriate.
This does not affect your statutory rights.

🔁 Can I exchange an in-store purchase? Exchange

Yes — we can offer an exchange or gift voucher if the return meets our conditions.

GT Aggressor 27.5 Expert Mountain Bike Silver - Medium

Brand:GT

Code:1GT28SM

Built with a 6061-T6 aluminum frame, the Aggressor Expert is light, strong, and designed to handle rugged trails while keeping the ride smooth. The frame’s geometry ensures you're balanced for both comfort and control, whether you're hitting tough trails or cruising around town.

The SR Suntour XCM-DS fork offers a generous 100mm of travel, providing more suspension than the Aggressor Comp. This means the Expert handles rocks, roots, and bumps with ease, giving you better confidence and control on rougher terrain. Perfect for riders looking to push their off-road limits.

The Aggressor Expert features a 24-speed Shimano drivetrain that ensures you’ll always have the right gear for any climb, descent, or sprint. With quick, precise shifting, it gives you the versatility to tackle a range of trail conditions without missing a beat.

One of the biggest upgrades in the Expert model is the addition of Tektro hydraulic disc brakes. These offer superior stopping power, especially in wet or muddy conditions, giving you full confidence in your ability to stop quickly and safely—no matter the terrain or weather.

With 27.5-inch double-walled rims and all-terrain tires, the Aggressor Expert strikes the perfect balance between speed and traction. The wheels are nimble enough for quick maneuvers, while still providing the stability needed for more technical trails, giving you the best of both worlds.

The sleek, aggressive design of the GT Aggressor Expert not only looks the part but also ensures a comfortable ride thanks to its well-designed geometry. Whether you're out for a long ride or attacking short, challenging sections, this bike gives you the performance and style that stand out.

For a bike in this price range, the GT Aggressor Expert offers outstanding components usually found in higher-end models. You’re getting premium features, like hydraulic disc brakes and a 100mm travel suspension fork, for a price that won’t break the bank—making it one of the best deals in the mountain biking world.

Technical Information
Frame:
GT Alloy Triple Triangle - Medium
Fork:
SR Suntour XCM, 80mm, Hydraulic Lockout
Stem:GT Alloy, 31.8, 8° Up
Handlebar:GT Alloy Riser, 25mm Rise, 720mm Width, 6° up, 8° back
Gears:Shimano SL-M315, 8-speed
Brakes:Tektro M275 Hydro, 160/160mm Rotor
Chainset:Shimano TY301, 42/34/24T
Cassette:Shimano Acera, 12-32T
Chain:KMC Z8.3, 8-speed
Rear Derailleur:Shimano Tourney
Seatpost:GT All Terra Two Bolt Alloy
Saddle:GT MTB
Wheels:27.5" WTB SX19, 32h Q/R
Pedals:GT Slim Line Flat Peda
Tyres:WTB Ranger Comp, DNA Compound, 27.5" x 2.25"
Sizing Information

Which size bike is best for you? Take a look at the following guide for our bikes to help find the right size for you.

Adults bikes and those for 10/11 years and over, are generally measured by frame size. This is normally the measurement between the centre of the bottom bracket to the top of the seat tube.

Rider Height (feet & inches)
MTB / Offroad Bike Frame SizeHybrid Bike Frame SizeRoad Bike Frame Size
5' to 5'4"14" - 16"15" - 17"48 - 50cm
5'4" to 5'8"16" - 18"17" - 19"50 - 52cm
5'8" to 6'18" - 20"19" - 21"52 - 56cm
6' to 6'2"20" - 22"21" - 23"56 - 60cm
6'2" to 6'4"21" - 23"22" - 24"58 - 64cm
Professional Opinion

If you are new to cycling, you've probably heard of a mountain bike.

Designed for off-road riding, mountain bikes have enhanced durability and performance highlighted in rough terrains, typically equipped with large knobbly tyres.

Nowadays there are lots of different types of frame style mountain bikes to choose from, ranging from rigid style, front suspension or full suspension.

Rigid- Without any suspension, a good A to B ride for someone who is new to cycling and just wants a bike with minimal maintenance compared to a bike with suspension qualities.

Hardtail- Equipped with a front suspension fork, which absorbs bumps in the road. Perfect for getting to grips with off-road riding.

Full Suspension- Equipped with a front suspension fork and rear shock.Full suspension mountain bikes are perfect if most of your riding will be off-road.Although the rear shock can carry a weight penalty, it can provide extra comfort on long days, particularly for those who suffer from knee or back pain

There are also three different options when it comes to wheel size on a mountain bike, 26", 27.5" (650B) & 29".The size of your wheel determines the level of rolling resistance you will get on the trails. Having a bigger wheelbase allows you to overcome bigger obstacles.

26" Wheel - Being smaller, lighter and more agile, bikes with 26” wheels offer much better acceleration than their larger counterparts, making it great for short, steep climbs and fast-flowing, quick-turning trails.

27.5" Wheel - The 27.5” wheels don’t bend as much as the big 29ers and handle a lot better in terms of manoeuvrability and durability. They’re faster, stronger and more agile than the bigger wheels and also ride much more fluently than the smaller. The best of both worlds.

29" Wheel - The 29 inch bike is longer than a 26 inch ride, and as such offers a lower centre of gravity. This means the rider has a much steadier feel on the bike, but it can take a while to readjust to the new riding position if you’re upgrading from a 26" wheel.

As a general rule, the more aggressively you plan to use the bike, and the more difficult the terrain you plan to ride over, the more advanced features you'll want on your bike. Here at Cycle King, You'll find the perfect bike for you at the point where your needs and your budget intersect.

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