Schroth Clubman II, Profi II And Flexi II: Which Belt You Actually Need
Schroth harnesses, compared properly
Schroth build the Clubman II, the Profi II and the Flexi II, and most pages comparing them sort them into budget, professional and versatile. That is not wrong, but it is not the decision you actually have to make first. The first question is whether you run a head and neck restraint, because that alone rules half of these belts in or out before price gets a look in.
The second question is how long you need the belt to stay valid, and that is where our own stock splits in a way the old version of this page got wrong. Cameron has been back through every listing for this rebuild, so the figures below are what we actually hold and ship today.
- A 2in (44mm) shoulder strap is homologated only for use with an FHR, it is a restriction, not an option
- Our 4-point ASM belts are listed as FIA 8854-1998, the 6-point belts as FIA 8853-2016
- An 8853-2016 belt gets a five year extension, an 8854-1998 belt gets none
- ASM is Schroth’s anti-submarining fold, sewn into one shoulder belt
- Prices run from £298.55 to £464.86 including VAT for a single belt
The range at a glance
Everything Schroth we hold in these three families, with the figures that actually decide the purchase. All prices include VAT and are correct on 13 August 2026.
| Belt | Points | Shoulder to lap | FHR | Homologation | Price |
|---|---|---|---|---|---|
| The 4-point ASM belts | |||||
| Clubman II ASM | 4 | 3in to 2in | No FHR | FIA 8854-1998 | £298.55 |
| Profi II ASM | 4 | 3in to 2in | No FHR | FIA 8854-1998 | £375.76 |
| The 6-point belts | |||||
| Clubman 2x2 | 6 | 2in to 2in | FHR only | FIA 8853-2016 | £363.18 |
| Profi 2x2 HANS/FHR | 6 | 2in to 2in | FHR only | FIA 8853-2016 | £429.76 |
| Profi 3x2 | 6 | 3in to 2in | Either | FIA 8853-2016 | £444.01 |
| Flexi 2x2 | 6 | 2in to 2in | FHR only | FIA 8853-2016 | £464.86 |
FHR column uses our own shop wording, not FIA language. "FHR only" is a belt Schroth build specifically to be worn with a device, "Either" is a 3in shoulder belt that works with or without one, and "No FHR" is a belt we do not list as compatible with a device at all.
Corrected on this page, 13 August 2026An earlier version of this guide said all three families were FIA 8853-2016 and that the Clubman II had 2in FHR-compatible shoulder straps. Both were wrong against our own listings and against Schroth’s spec. The 4-point ASM belts we stock are listed as 8854-1998 with a 3in shoulder strap. Schroth do build the Clubman II to both standards depending on the production run, so check the label on the belt you receive, and if your championship needs a specific standard tell us when you order and we will confirm it before it ships.
What ASM actually is
ASM turns up in most of the Schroth part names and almost nobody selling them explains it, so here it is in Schroth’s own terms. ASM stands for anti-submarining, and submarining is the word for sliding forward underneath the lap belt. Schroth’s system is an extra fold of webbing sewn into one shoulder belt, which pays out at a different rate to the other side and works to keep the wearer back and down in the seat.
It is a Schroth patent and it is why these belts carry the ASM name in the part number. If you see two otherwise identical Schroth belts at different prices, ASM is often the difference.
Strap width, and the rule most people miss
Everyone talks about 3 inch and 2 inch belts as though it is a comfort preference. It is not. The FIA standard sets a minimum shoulder strap width of 70mm, the 3 inch, and then permits a narrower 44mm strap, the 2 inch, on one condition.
That condition is that it is worn with a head and neck restraint. Article 6.4.1.1 restricts the 44mm strap to use with an FHR and the belt carries a specific FIA label saying so. So a 2 inch harness is not the lightweight upgrade, it is the device-specific one.
Minimum shoulder strap width under load, FIA 8853-2016
3in shoulder, the 70mm strap70.0 mm
2in shoulder, the 44mm strap44.0 mm
Lap strap, either build44.0 mm
Crotch strap44.0 mm
010203040506070
Read from the FIA 8853-2016 standard itself, articles 6.1.1, 6.2.1 and 6.4.1. Inches never appear in the standard, "3 inch" and "2 inch" are trade shorthand for 70mm and 44mm. The important part is article 6.4.1.1: the 44mm shoulder strap is not a lighter alternative you can pick freely, its use is restricted to being worn with an FHR and it carries a specific FIA label saying so.
The short versionA 3in shoulder belt works whether you run a device or not. A 2in shoulder belt is homologated only with a device. If you do not own an FHR and are not about to buy one, you want a 3in shoulder belt, which on this page means the Clubman II ASM, the Profi II ASM or the Profi 3x2.
The FHR question, answered two ways
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You run an FHR, or you are buying one
Go 6-point and 2in shoulder. The Clubman 2x2 at £363.18 is the way in, the Profi 2x2 at £429.76 steps up the hardware, and the Flexi 2x2 at £464.86 adds the reversible lap belts. All three are FIA 8853-2016, so they carry the five year extension as well.
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You do not run an FHR
You want a 3in shoulder strap. The Profi 3x2 at £444.01 is the one we would point you at first because it is 8853-2016 and it still works later if you do buy a device. The 4-point Clubman II and Profi II ASM belts also sit here and cost less, with the expiry caveat below.
How long each one stays valid
This is the part that catches people out, and on our current stock it splits cleanly down the middle of this page.
How long each standard lasts, counted from manufacture
FIA 8853-2016To the date on the label+5 year extension
FIA 8854-1998To the date on the label, then done
made+1+2+3+4+5+6+7+8+9+10
From Motorsport UK’s own harness guidance. An 8853-2016 belt gets a five year extension on top of the date printed on its label, so a belt marked "not valid after 2018" runs to 31 December 2023. An 8854-1998 belt gets no extension at all, so the date on the label is the date. That difference is the single biggest practical reason to look at the 6-point belts on this page over the 4-point ASM ones if the car is going competing.
What Garreth would buyIf the belt is going in a car that competes, buy the 8853-2016 one. The extra fifty or sixty pounds over a 4-point ASM belt buys you a standard that gets a five year extension instead of one that gets none, and you are far less likely to be buying belts again before you expected to. If it is a road or track day car and scrutineering is not in the picture, the 4-point ASM belts are a genuinely good belt for the money.
The belts
Everything above, in stock and ready to order. Singles unless the name says otherwise.
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From £298.55 Incl. VATPayPal CreditSelect options This product has multiple variants. The options may be chosen on the product page
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From £375.76 Incl. VATPayPal CreditKlarna ReadySelect options This product has multiple variants. The options may be chosen on the product page
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From £464.86 Incl. VATPayPal CreditKlarna ReadySelect options This product has multiple variants. The options may be chosen on the product page
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From £429.76 Incl. VATPayPal CreditKlarna ReadySelect options This product has multiple variants. The options may be chosen on the product page
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From £444.01 Incl. VATPayPal CreditKlarna ReadySelect options This product has multiple variants. The options may be chosen on the product page
Fitting angles and hardware
A belt is only as good as what it is bolted to, and these are the figures Motorsport UK publish in their own harness guidance.
Shoulder strap angle. No more than 45 degrees below horizontal. If you run an FHR that tightens to no more than 20 degrees below horizontal, and the straps must never angle upwards from your shoulders to the mounting point.
Bolts. Minimum 7/16in UNF or M12 grade 8.8. If you are creating new mounting points in the shell instead of using existing ones, they want counter plates of at least 40cm2 and 3mm thick.
Looping around a harness bar. Three passes through the 3-bar slide and leave 100mm of tail, with the slide sitting as close to the bar as it will go.
Snap-in or bolt-inThe Flexi comes with snap-in attachments at the lap and sub points as standard and bolt-in hardware is available separately. We stock Schroth bolt-in end fitting kits at £22.80 including VAT if you would rather bolt straight to the shell.
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Not sure whichTell us the car, the class and whether you own a device
Those three answers pick the belt on this page every time, and they take a minute on the phone. Cameron will also check the strap lengths against your seat and mounting points before anything ships, which is worth doing whichever belt you land on.
Common questions about Schroth belts
What does ASM stand for?
Anti-submarining. Schroth describe it as an extra fold of webbing sewn into one shoulder belt that pays out at a different rate to the other side, working to keep the wearer back and down in the seat. It is a Schroth patent and it is why the belts carry ASM in the part name.
Can I use a 2 inch Schroth belt without a HANS device?
No. FIA 8853-2016 restricts the 44mm shoulder strap to use with an FHR, and the belt carries a label saying so. If you do not run a device you want a 3 inch shoulder belt, which means the Clubman II ASM, the Profi II ASM or the Profi 3×2.
Which of these is FIA 8853-2016?
On our current stock, all the 6-point belts: the Clubman 2×2, the Profi 2×2, the Profi 3×2 and the Flexi 2×2. The 4-point Clubman II ASM and Profi II ASM are listed as FIA 8854-1998. Schroth build the Clubman II to both standards depending on the run, so check the label on the belt you receive and tell us if you need a specific one.
How long does a Schroth harness last?
An 8853-2016 belt runs to the date printed on its label and then gets a five year extension on top. An 8854-1998 belt runs to the date on its label with no extension. Your championship can set a stricter rule than the national one, so check your own regulations before you rely on the extension.
What is the difference between the Clubman II and the Profi II?
Hardware and adjusters. The Profi II uses lighter, higher grade adjusters and a rotary cam lock buckle, and its sub strap adjusts where the Clubman II’s does not. Both are 4-point ASM belts with a 3in shoulder and a 2in lap strap, and there is about £77 between them.
What makes the Flexi II different?
Its lap belts reverse. You can configure them as pull-up or pull-down, so the same belt suits mounting points that would normally need two different harnesses. It is the one to buy if the car changes, or if the belt might move to another car later.
Where to go next
For the width question on its own, across every brand we carry and not just Schroth, our 3 inch against 2 inch FIA harness guide goes through it in full. The complete FIA motorsport harness range covers TRS, Sabelt, OMP, Sparco, Willans, Luke and Takata alongside Schroth.
Ring 0115 9893488 with the car, the class and whether you run a device, and Cameron will confirm the belt and the strap lengths before you order.
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