⟲ 360° — drag meThe facts.
| Brand | Accossato |
|---|---|
| Type | Off-road floating swingarm chain slider |
| Part number | GSM1 |
| Colours | Black, orange, blue |
| Use | Off-road (enduro, motocross) |
| Fitment | KTM 300EXC (2012–2020) |
| Check | Compare with the application list before ordering |
| Road approval | None documented, off-road and competition use |
DescriptionThe whole story▼
Lending a 300 EXC to a riding mate for a weekend usually means handing over a bike that has to cope with someone else's riding style for a day or two, and the chain line takes whatever that different style throws at it along with everything else. Accossato lists the GSM1 for the 300 EXC between 2012 and 2020, a floating swingarm slider mounted so it can move with the chain rather than holding it to one fixed line.
Key Features
- Floating swingarm chain slider for the KTM 300 EXC, 2012 to 2020
- Accossato code GSM1, mounted so it can follow the chain's movement
- Orange, blue or black
- Also listed for a wide run of other KTM two-stroke and four-stroke off-road models
- Can be combined with Accossato's GPM1 slider and either axle block for this bike
- No German ABE on file; built for off-road and competition use
Construction and Material Quality
Rather than staying fixed at one point, the GSM1 sits in a mount that lets the whole piece track the chain's own movement instead of holding it to a single rigid line. Accossato offers the usual three finishes for this bike, orange, blue and black, so a part bought on its own still matches whatever else is fitted. A mount that feels looser than normal is worth a check at the same time as the chain.
Handing the Bike to Someone Else for the Weekend
A bike loaned out for a weekend gets ridden to someone else's habits rather than the owner's own, which can mean a harder pace, an unfamiliar trail, or simply more aggressive use of the throttle than the bike normally sees, and all of that shows up in the chain line before it shows up anywhere else. Checking the slider once the bike comes back, rather than assuming it is fine because nothing looks obviously broken, is a sensible habit whenever a machine has spent time under someone else's control. It costs little to look, and it means any wear from the loan gets caught before the next ride rather than put down to the owner's own riding later.
Fitment and Compatibility
The 300 EXC sits on Accossato's list for the GSM1 across the full 2012-to-2020 run, and the identical part also appears against a long run of other KTM two-stroke and four-stroke off-road models sharing this swingarm shape. Checking the exact model and year against that list is still worth doing before ordering. No chain guide is listed for this bike, so the GPM1 slider and either axle block complete the chain-care range Accossato offers for the 300 EXC.
Road Approval
Accossato lists no German ABE for the GSM1, so the part is intended for off-road and competition riding rather than public roads.
Scope of Delivery
Supplied as one floating swingarm slider in the colour chosen at checkout.
Specifications
- Type: Off-road floating swingarm chain slider
- Part number: GSM1
- Colours: Black, orange, blue
- Use: Off-road (enduro, motocross)
- Fitment: KTM 300EXC (2012–2020)
- Check: Compare with the application list before ordering
- Road approval: None documented, off-road and competition use
What's includedEverything in the box▼
- 1x Accossato floating chain slider
FitmentWhich bikes this fits▼
- KTM 300EXC (2012–2020)
- KTM 125EXC (2012–2016)
- KTM 125SX (2011–2015)
- KTM 150SX (2010–2015)
- KTM 200EXC (2012–2016)
- KTM 250EXC-F (2012–2020)
- KTM 250SX (2011–2016)
- KTM 250SX-F (2011–2015)
- KTM 350EXC-F (2012–2020)
- KTM 350SX-F (2011–2015)
- KTM 450EXC-F (2012–2020)
- KTM 500EXC-F (2012–2020)
Questions, one topic at a time.
Get the real shipping cost for this item to your address — the same rates as checkout.
Choose a destination and hit Estimate — we fetch the live rates for this item.
We’re based in Germany. Standard delivery goes by DHL and national postal services and takes about 2–5 days within Germany, 1–2 weeks within the EU and 2–6 weeks outside the EU. Need it sooner? Express delivery reaches most of the world within a few days — just choose it at checkout where available.
Your exact shipping cost is calculated by destination and weight and shown at checkout before you pay — no hidden fees. Express delivery is selectable at checkout where available.
Yes, we ship to over 130 countries. Prices, taxes and delivery times for your destination are calculated automatically at checkout.
Within the EU, no — our prices already include all duties and EU VAT. For deliveries outside the EU (e.g. Switzerland, the UK or the USA), your order may be subject to import duties and taxes set by your country. These are collected by the carrier when your parcel arrives, aren’t included in our prices, and are outside our control.
As soon as your parcel ships we email you a tracking link, so you can follow it all the way to your door.
On out-of-stock items you can request a delivery time or leave your email to be notified the moment it returns — just use the notification box on the product.
You have the right to cancel within 14 days of receiving your order. Register your return by email first; once it’s approved you have a further 14 days to send the goods back. Items should be unused and in their original packaging.
Register your return by email with your order number before sending anything back, and we’ll send you the return instructions. Please note: returns that aren’t registered in advance can’t be accepted.
The quickest way is to place a new order for the size you need and register a return for the original by email — just let us know it’s an exchange.
We’re sorry — that shouldn’t happen. Contact us with your order number and a photo as soon as you can, and we’ll arrange a replacement or refund right away. Faulty goods are always covered by your statutory warranty.
Refunds go back to your original payment method, usually within 3–5 working days of your return reaching our warehouse.
PayPal, all major credit and debit cards (Visa, Mastercard, American Express), Klarna (pay later and instalments), Apple Pay, Google Pay and more — all processed securely via PayPal and Mollie.
Yes. Choose Klarna at checkout to split your purchase into flexible monthly installments.
Your payment is taken when you place your order. If you choose Klarna, you pay later according to Klarna’s terms.
Every payment runs over an SSL-encrypted connection through certified providers. We never see or store your full card details.
If your order hasn’t shipped yet, contact us as soon as possible and we’ll do our best to change or cancel it.
No — you can check out as a guest. An account simply lets you track orders and reorder faster.
For customers in the EU, prices are shown including your country’s local VAT. For customers outside the EU, prices are shown without VAT — instead, your country’s import taxes and duties may apply on delivery (see the customs question).
Yes. Your invoice is attached to your order confirmation email and is also available in your account.
Yes. We’re an authorised dealer, so every product is 100% original and comes with the full manufacturer warranty.
Yes. Everything we sell is genuine and comes with the manufacturer’s warranty, on top of your statutory rights. Keep your invoice as proof of purchase and contact us if you ever need to make a claim — we’ll help you through it.
Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
Our team will personally help you choose the right gear or part — around 24h for a reply.