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GSM Performance Customer Car Colouring Book Edition 1
Roll Cages For A Porsche 924 At Full Motorsport UK Events
Customer question, Porsche 924
A customer rang wanting a cage for his Porsche 924 and, importantly, told us what he intended to do with it: full Motorsport UK events. That last part changes the answer completely, because at that level the question stops being which cage looks the part and becomes which route to an acceptable cage you are taking.
There are two 924 answers in our range and they sit on opposite sides of that line. Here is which is which, what decides it for your particular car, and the two things about a 924 that catch people out before they get as far as choosing.
- For a 1976 to 1985 924 with no sunroof, the Safety Devices P000 at £749 is the direct answer: bolt-in, 45mm CDS, and independently certified Motorsport UK and FIA homologated
- The rear half of that cage on its own is £429 and can be used without the front section
- A 924S is the later car, and Custom Cages list a multipoint weld-in for it: CDS at £1150 or T45 at £1545
- Those weld-in kits are built to FIA prescribed tube sizes, which is the build-to-specification route, not a certificated design
- The P000 is listed for cars with no sunroof, and we have no certificated sunroof option for a 924, so ring us if yours has one
- Bolt-in is explicitly permitted by the regulations. Individual championships can still set their own rules, so check yours
What "acceptable at a full event" actually means
Roll cages sit in Motorsport UK’s National Competition Rules at Chapter 7 Appendix 3, under the heading ROPS, which stands for Roll Over Protection System. That appendix is where the requirements live, and it recognises the cage in front of the scrutineer in one of two ways: either it was built to the specification set out in that appendix, or it carries an approval, meaning an FIA homologation or a Motorsport UK ROPS Certificate.
Worth knowing that the phrase Motorsport UK approved cage is trade shorthand, ours included. The words the regulations actually use are Homologated, ASN Certified and ROPS Certificate. It matters here because our two 924 options take different routes, and the certificated one is the easier life at a full event: the cage has an identification plate, there is a certificate to present, and the scrutineer is checking paperwork against a known design instead of measuring your tube.
The identification plateAny certificated or homologated cage made after 1 January 1997 has to carry a plate giving the manufacturer and their part number for that cage, and those details appear on the certificate itself. Keep the original certificate with the car. If you buy a 924 that already has a cage in it, the plate and the paperwork are the first things to look for.
Which 924 have you got?
Two questions decide your cage before brand or budget come into it, and both are about the car, not the racing.
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Before or after the dash change
Safety Devices split their Porsche cages at the dashboard revision. Their 924 cage covers the pre-dash-change car, 1976 to 1985. The 924S arrived for 1986 and is the later car, which is why Custom Cages list it as its own kit.
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Sunroof or solid roof
The Safety Devices 924 cage is listed for cars with no sunroof. A sunroof changes where the roof tubes can land, and their sunroof weld-in cage is listed for the 944 and 968 only, not the 924.
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Front and rear, or rear only
The 924 cage comes as a full six point kit or as the rear section on its own. The rear can be used without the front, which is the usual route for a car that is not yet a full competition build.
The cage we would fit
For a 1976 to 1985 924 with a solid roof going to full events, the Safety Devices P000 is the one. It is a six point bolt-in in 45mm CDS tube, it clears the standard trim and dashboard, and Safety Devices state it is independently certified, Motorsport UK and FIA homologated. That is the certificated route, and it is why this cage is £749 while a bare weld-in kit is more.
You choose the internal arrangement when you order: a single fixed diagonal, a single diagonal with a harness bar, or a cross diagonal with harness bars, each with or without door bars. If the car is going to carry harnesses, take a version with the harness bar, because that is what the shoulder straps should be anchoring to.
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From £898.80 Incl. VATPayPal CreditKlarna ReadySelect options This product has multiple variants. The options may be chosen on the product page
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From £514.80 Incl. VATPayPal CreditKlarna ReadySelect options This product has multiple variants. The options may be chosen on the product page
Those four are the whole 924 picture: the certificated Safety Devices cage and its rear-only version, then the two Custom Cages weld-in kits for the 924S. The rest of the range is on our Porsche roll cages list, though be careful there, because most of the Porsche transaxle cages are cut for the 944 and 968 and will not fit a 924.
| Safety Devices P000 | Custom Cages 924S | |
|---|---|---|
| Fits | 924 pre-dash-change, 1976 to 1985, no sunroof | 924S |
| Fitting | Bolt-in | Weld-in |
| Points | 6 point | Multipoint, 8 point minimum |
| Tube | 45mm CDS | CDS, or T45 on the dearer kit |
| Route | Independently certified, Motorsport UK and FIA homologated | Built to FIA prescribed tube sizes |
| Supplied | Finished, powder coated black as standard | Bare metal kit, laser profiled and mandrel bent, ready to weld |
| Price | £749 full cage, £429 rear only | £1150 in CDS, £1545 in T45 |
Ex VAT. Both are made in the UK. The route line is the one that matters for a full event, and it is the reason to read past the price.
When the weld-in kit is the right answer
If your car is a 924S, or the build has gone far enough that a bolt-in no longer suits it, the Custom Cages kits are the route. They are laser profiled and CNC mandrel bent to the shell, they come as numbered tubes with a checklist and footplates, and because the cage sits close to the bodyshell it is normal to weld it in at far more than the minimum eight points.
Be clear about what you are buying though. These are built to the tube sizes the FIA prescribe, which is the build-to-specification route. There is no certificate in the box, so the cage is judged on how it is built and how it is fitted, and the quality of the welding becomes part of the safety case. That is a job for somebody who does it for a living.
On CDS against T45, the honest position is that T45 is lighter for the same strength and costs more. We would not tell you it is required, because the minimum tube sizes in the regulations apply whatever the material you build in.
How it mounts, and what the rules ask for
Bolt-in cages are explicitly permitted. The regulations set out what the mountings have to be, and they are worth knowing before you or your fabricator start, because this is the part that gets picked up at scrutineering.
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Each rollbar leg
At least three bolts, minimum M8 ISO grade 8.8, onto a steel reinforcement plate at least as thick as the tube wall it is welded to, minimum 3mm, and at least 120cm2 in area, welded to the bodyshell. The foot or leg may be welded straight to the shell instead.
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Each backstay
Bolts totalling at least two thirds of the area asked for on a rollbar leg, with reinforcement plates of at least 60cm2. A single bolt in double shear is allowed if it is strong enough and a bush is welded into the backstay.
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Minimum mountings
One for each leg of the main or lateral rollbar, one for each leg of the front rollbar, and one for each backstay. On a 924 the floor is what those plates land on, so check the state of it before you order anything.
A certificated cage must not be modifiedOnce a cage holds a homologation or a certificate, the only things permitted to be added are roof reinforcement, windscreen pillar reinforcement, doorbars and harness bars. Drilling it, cutting it or welding brackets to it for anything else is a modification, and that ends the approval the cage was bought for. If a cage has been in an accident it goes back to the manufacturer, not to a local shop.
Padding, and the bit people get wrong
Motorsport UK’s appendix says non-flammable padding should be provided where the driver’s body or helmet could contact the cage, and recommends that tubes within 150mm of the helmet are covered with a suitable energy absorbing material. Those are its words, should and recommended.
Under FIA Appendix J it is firmer: padding to FIA 8857-2001 Type A is compulsory on the tubes the drawing identifies and on all roof reinforcements. So the answer depends on what you are entering, and plenty of individual championships make the FIA standard compulsory in their own regulations regardless. In a 924, where the roof is low and the main hoop ends up close to your head, we would pad it properly whatever the event asks for.
Common questions
Will a bolt-in cage be accepted at a full Motorsport UK event?
Bolt-in mounting is explicitly permitted by the regulations, and the Safety Devices 924 cage is a certificated bolt-in design. What we cannot tell you is what your particular championship asks for, because organisers set their own supplementary regulations. Check those before you order, and if they are ambiguous, ask the club, not us.
Will a 944 cage fit my 924?
Only where the listing says so. The Safety Devices P000 is listed for both the 924 and the 944 in pre-dash-change form, which is why it appears under both. Most of the other Porsche transaxle cages we list are cut for the 944 and 968 specifically and are not 924 fitments.
My 924 has a sunroof. What are my options?
Not the P000, because it is listed for cars without one, and the Safety Devices sunroof weld-in cage is a 944 and 968 fitment. There is no certificated sunroof answer for a 924 in our range, so ring us with the car and we will look at what can be done rather than sell you something that does not fit.
Is T45 better than CDS?
It is lighter for the same strength, and it costs more. It does not let you use thinner tube on a build-to-specification cage, because the minimum tube dimensions in the regulations apply whatever the material. Choose it if weight matters enough to you to pay for it.
Do I need a harness bar?
If you are running harnesses, the shoulder straps need a proper anchorage, and a harness bar on the cage is the usual answer. The Safety Devices 924 cage is offered in versions with one, so specify it when you order instead of adding it later, because adding anything to a certificated cage afterwards is restricted.
What about seats and harnesses for the car?
Our Porsche 924 bucket seat guide covers the seats and the frames that fit this car. Get the cage decided first though, because a harness bar position and a seat position have to work together.
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The next stepTell us the year, the roof and the championship
Three things settle a 924 cage: whether it is pre-dash-change or a 924S, whether it has a sunroof, and which championship you are entering. Ring Cameron on 0115 9893488 with those and he will tell you which of these cages is actually yours, and which internal arrangement to specify. If it turns out we have nothing certificated for your car, Garreth would sooner tell you that than sell you a kit that will not do the job.
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