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AG2728
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Harness advice

I have never got on with the Caterham (Luke) harness / Tillet seat combination as the pull-down lap belt adjusters were a pain to use, so after much research on here and elsewhere, I bit the bullet this weekend and bought a set of Schroth ASM 4 points (pull-up adjusters) with the anti-submarine mechanism built into the shoulder strap.

While I was in a rare spending mood, I decided to go belt and braces and also get the crutch straps as they seemed a reasonable price.

So tonight I took the seat out and fitted the Schroths and they are a marked improvement in terms of ease of use.

I have, as others seem to have done, bolted the locating eyes for the crutch straps to the original rear seat mounts. Straps then routed under the seat and exiting though the centre hole in the seat base.

My problem is that even adjusted to full extension on all 4 adjusters on the straps, they are still too short by around 75mm, when my seat is in the correct position.

Has anyone come across this before or is there an alternative place to locate the crutch strap mounts, ahead of the seat mounts I have used???

Andy

StevehS3
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I don't know about Scroth but my Titan belts needed ordering with extra long crotch straps to suit the 7. I think the mounting points must be further back in the 7 compared to most cars.

Jonathan Kay
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... and bought a set of Scrhroth ASM 4 points... 

Why those rather than the Schroth Caterham set?

Jonathan

AG2728
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Why those rather than the Schroth Caterham set?

They are the Schroth Caterham specific 4 points, with the ASM system.

The crutch strap set is generic.

Jonathan Kay
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Ah... got it.

Thanks

Jonathan

AG2728
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My Titan belts needed ordering with extra long crotch straps to suit the 7.

Makes absolute sense. Just can't believe this is first time I have heard this mentioned, after my rigorous and extensive due diligence and research.

Why is it the simple jobs are never straight forward?

7 wonders of th...
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you need plate ends on the straps to accept 7/16" bolts not snap hooks as I suspect you have, if your running lowered floors you also need the long bolt nd spacers in order to correctly anchor the rear of the crutch straps.

not sure how schroth incorporate an anti submarine in their shoulder straps as this is a function of the crutch in conjunction with correctly tensioned lap belts.

As previously mentioned there are specific belt sets for caterhams from all the main manufactureres with options on the lap belts width and tensioner

AG2728
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7 wonders

Yes, I've got snap hooks, mounting eyes and 3mm mounting plates. I do have lowered floors.

I don't understand how swapping to plate ends would help me, as if they were mounted in the same place, my belts would still be too short. Have I misunderstood?

The anti-submarine ASM mechanism is peculiar to Schroth and is incorporated in 1x shoulder strap. Yes it sounds weird.

https://www.youtube.com/watch?v=8nsg_ze-CG8​

As said, the 4 point set are indeed Caterham specific. The crutch straps however are generic.

I have built it back up as 4 point only for now until I get my head around the best way to solve it.

Thanks

Andy

Jonathan Kay
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AG2728
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To mount the crotch strap you can either use the lower side mounts (so its really a 4 point and is somewhat frowned upon) or drill out the small holes on the two old type seat mounting points at the base of the seat area.

I have decided if I am going to have 6 straps, then I would like 6 mounting points. Otherwise I will stick to 4 point harnesses.

As it happens, the crutch strap mounting kit supplied did not require any drilling to attach to the old seat mounts. Maybe dimensions haver changed on later cars??

Cheers

Andy

Englishmaninwales
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Caterham also supply a complete 6 point Schroth

https://caterhamparts.co.uk/seatbelts-harnesses/6490-schroth-6pt-rh-kit.html

Not clear if this is the same?