D.I.D 520ERT3 G&G gold chain, 102 links, non O-ring – Sur-Ron Ultra Bee
D.I.D 520ERT3 G&G gold chain, 102 links, non O-ring – Sur-Ron Ultra Bee
- D.I.D ERT3 series racing chain, 520 size, gold outer and inner plates, 102 links. Non O-ring for the lowest possible drag. Supplied open with a clip master link. For Sur-Ron Ultra Bee.
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ERT3 stands for Exclusive Racing Technology – a non O-ring build designed for MX machines up to 450cc. No seals means the lowest internal drag in the D.I.D range: less power eaten by the drivetrain, sharper throttle response. The trade-off is more frequent lubrication than a sealed chain. That is a deliberate racing choice, not a cost saving.
Tensile strength 8,300 lbs (approx. 37 kN) at 2.99 lbs per 100 links. Even with a tuned controller the Ultra Bee works far below the torque of a 450cc combustion motocrosser, so this chain is heavily over-specified for the job – which translates directly into service life.
98 or 102 links?
| Version | When | Note |
|---|---|---|
| 98 links | Stock rear sprocket or smaller | Shorter wheelbase, adjuster near the start of its range |
| 102 links | Oversized rear sprocket (e.g. 54T) or 21" wheel with the axle moved back | Room for a longer wheelbase and adjustment |
| Not sure | Count the links on your current chain | The only reliable method – count links, not centimetres |
Critical: 520 is not interchangeable with 420. The Sur-Ron Light Bee runs a 420 drivetrain – this chain does NOT fit it.
What's in the box
D.I.D 520ERT3 G&G chain
102 links, gold outer and inner plates, non O-ring
Clip master link
Clip type (loose-fit) master link, per the D.I.D standard for the ERT3 series
What is NOT included
Sprockets (front or rear), riveting/breaking tool, chain lube. The chain ships open – you fit it and close it with the clip master link.
D.I.D 520ERT3 G&G – gold outer and inner plates
96 CNC aluminium 54T sprocket for the Ultra Bee – sold separately
Technical data (D.I.D)
| Model | D.I.D 520ERT3 G&G |
| Size | 520 |
| Link count | 102 |
| Sealing | None (non-sealed, no O-rings) |
| Tensile strength | 8,300 lbs (approx. 37 kN) |
| Weight | 2.99 lbs / 100 links (approx. 1.36 kg) |
| Max application per D.I.D | 450cc |
| Chain Life Index | 410 |
| Master link | Clip (loose-fit) |
| Colour | Gold G&G (outer and inner) |
| Manufacturer | D.I.D, Japan |
Figures taken from the D.I.D catalogue sheet for the 520ERT3 series.
Sur-Ron Ultra Bee520 drivetrainNOT for Light Bee (420)
Before you order
- Count the links on your current chain – this is the only reliable way to choose.
- Confirm your bike runs a 520 drivetrain. The Light Bee runs 420 and this chain will not fit.
- Going to a larger rear sprocket usually needs a longer chain.
- A non O-ring chain needs lubricating more often than a sealed one – plan for it.
Frequently asked
Why no O-rings?
Because seals create drag. ERT3 is a racing build – it delivers maximum power to the wheel at the cost of more frequent lubrication. If you ride mostly on tarmac and want to forget about maintenance, a sealed chain is the easier choice.
Does it fit the Sur-Ron Light Bee?
No. The Light Bee runs a 420 drivetrain. This is a 520 chain and physically will not sit on 420 sprockets.
Can I shorten it?
Yes, but you need a chain breaker/riveter. Do not force it – a damaged link becomes the weakest point in the whole drivetrain.
How often should I lube it?
After every hard off-road session and after any contact with water or mud. A non-sealed chain has no grease trapped in the bushings.
Complete the drivetrain
Not sure which length you need?
Message us – we will advise based on your sprocket and wheel setup. Shipped from Poland, in stock.
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