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AI is a lineal descendant of ELIZA, a computer program whose antecedents were developed in the days when computers had glowing tubes and communicated with the outside world via a modified Telex printer and keyboard, before it became a fax. I guess most of you, even those who think of themselves as in the prime of their middle age, weren't even born then.

When there were no more than about 500 computers in the entire world, I had a computer, an obsolete model given to me by a cousin who was chairman of the largest insurance company in the country, in return for bringing a bunch of engineers from the electrical engineering department (yeah, that long ago, before electronics was even a common word) to take the thing out neatly so that the new, more sophisticated version could be inserted in the temperature- and humidity-controlled space computers then demanded.

I used my computer in the basement of the Carnegie Library to design hemiheads for the Chrysler engines in my racing cars. This employed vector math tables made up from the computer's computational results to make hand drawn curves from which the twisted math was also used in the randomization required for the artificial psychiatrist. (Later I would use irreversible modular math, modified by the product of two very large primes to put some inarguable distance between the interlocutors and the subject, thus a double layer of irreversibility, at least as long as the two very large primes were also relatively prime.) I was dragged into the early pre-ELIZA speculation because I was qualified and innovative and curious enough to help those propagating such a monstrous underlying lie -- that a computer could be sentient -- which I didn't believe then, and don't believe now. I wrote the variations of "how do you feel about that" and prepared the outline for my programmers (like modern "coders" but in white coats because they were engineers and told by their teachers they should look like engineers) to have the variations served up either randomly or to reinforce the prejudices of the respondent based on linguistic analysis of whatever he said from the moment he stepped into our interview room, which a court reporter transcribed onto the keyboard in the next room in real time, so that by the time the formal test started, we knew quite a lot about the respondent, and could dice and mix it it into our own contribution, in those halcyon days literally by taking a pair of scissors to our paper roll of printout, pasting our up in some pattern, and having it typed back in to the computer. Those who later pretended we had our finger on the scales were just ignorant or had skin in the game of making people believe a computer could be sentient: the very point was our finger on the scales, without which the experiment wouldn't have worked, and with AI that is still the basic, 100% true operating principle, on a much larger scale:

AI gives you back only what you put in, reflects your biases and prejudices as illuminated in where you tell it to search for raw material, and in a thousand other ways. To expect otherwise is naive. The internet makes AI the lowest common denominator, monstrously magnified. It's like all the information in the world is filtered through Wikipedia's even dumber, more willfully ignorant, illegitimate cousin. Wikipedia is silly enough, but you ain't seen nothing yet of the chaos in existential information (crop yields, anyone?) that will arrive when AI starts feeding on its own tail of misinformation (weather forecasting after the decades-deep lies of the global warmies?).

Our early version of a computerized headshrinker was a satirical stab at making a computer sound like a psychiatrist; the proof was said to be that people in one room with no means of seeing that they were actually dealing with a computer in the next room, should think that they were talking to a live, human psychiatrist. ELIZA was crude, in some ways cruder than our early model, at root merely taking whatever the respondent gave it, and asking in as many ways as possible what the respondent felt about that.

Modern AI is the same thing, just bigger and slicker in its presentation, but the underlying lies are as crude as ever.

If you have to use AI, try GROK, which is a lot more honest and varied than the Google/Meta etc censors' version of AI (they say "curated" but they mean "our truth" or even "you proles can't handle the truth!").

AI is easily recognized as the 2026 version of the global warmie lie that "98 percent of scientists agree".

In this perspective, I think Thorn has escaped only lightly traduced by the clownish AI from Google. It could have been so much worse: Thorn bikes could easily have been loaded up with years of criticism of Mercury cars, the dissolute life-style of the messenger or the Gods, etc.
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From time to time I do an incognito search for Thorn Mercury reviews, in part to see how the model's reputation is faring and in part to see where Google's algorithm is ranking my lengthy owner-appraisal on here of the Mk3 650B.

It was nice to see my piece ranked at 2, but not so nice to see the highlight Google had chosen, which emphasised: Steering unladen was overly light and not terribly accurate.

Someone curious about the Merc may well have responded to seeing that tidbit by reading the referenced post, and might have discovered that the remark quoted described not the Mercury but the bike it replaced: my late-90s Trek 7900, a carbon-aluminium 700C hybrid.

But I've seen recent instances of people seeking advice on enthusiast forums and observing that AI says this or that about the product in question. And on its face, that seems fair enough: you wouldn't think the much-hyped technology, new as it is, would be so incompetent as to weight heavily in its response a remark someone had made online about a different product altogether.

Well, you would if you've been following the rollout of AI-powered bots and have a sense of their limitations.

As the screenshotted pic shows, the next item on the page is an AI summary that says in part:

"The Thorn Mercury (specifically the modern Mercury 40) is a premium, highly versatile steel sports tourer. Riders praise its classic, responsive 853 steel frame, ..."

When as we know, the Mercury 40 doesn't have an 853 frame – and as far as I can tell has received no praise online from any rider whatsoever.

We can all hope that AI gets better. Even if some clever people have proposed that it will mainly get worse, because it will be feeding increasingly on its own misinformation.
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Thorn General / Re: Fork for Raven Enduro?
« Last post by UKTony on June 13, 2026, 07:56:53 AM »
I’m sure Thorn would also be able to advise on a suitable disc fork. They might suggest this one which is fitted to two Thorn Stirlings (a similar MTB style successor to the Enduro) currently for sale on the SJSC/Thorn website.

https://www.sjscycles.co.uk/forks/the-light-blue-darwin-mt-700c-disc-fork-1-18-inch-black-50mm-offset/

or the more expensive

https://www.sjscycles.co.uk/forks/soma-jawbone-btype-fork-black/
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Bike Bits / Accessories For Sale / Thorn Stirling frameset small/medium
« Last post by Mark Manley on June 13, 2026, 07:01:27 AM »
I have for sale a the above frameset bought a few years ago off what I believe was the original owner and built up but not used for much other than some trail riding around the local woods.
It is a hub gear specific frame and I have had Sturmey Archer 3 speed, Shimano Alfine 11 speed and a Rohloff 14 speed in it at different times. It is disc and V brake compatible and has an almost new bottom bracket which has done less than 100 miles, a Hope headset but the bearings are not as smooth as they should be, the original seat post and two side loading bottle cages.
The seat post tube is 400mm, top tube 560mm and the stem is 260mm, there is a some of corrosion on the forks and bottom bracket which should be visible in the photos. The forks are Magura and hold pressure.
For some reason the previous owner filed out the front wheel slots which I have shown but this did not affect the mounting of any of the wheels I had in it, make your own mind up whether this is acceptable to you before buying, Thorn do sell a rigid fork for this bike. I have washed it but there may be some dirt left in out of the way places.
I would prefer pick up from just outside Axminster in Devon and will post within the UK but I would need to get a box which might take a few days as I do not own a car, I would use Parcelforce and expect it to cost under £20 but will get an accurate price if someone wants it sent. The frame number looks to be 582SM07016 but the powder coating is quite thick so this might not be totally correct.

Price is £140.

For photos here is a link to the listing on Retrobike.

https://www.retrobike.co.uk/threads/thorn-stirling-frameset-small-medium.508223/
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Thorn General / Re: Fork for Raven Enduro?
« Last post by Danneaux on June 12, 2026, 01:50:22 AM »
Hi Mikkel!

This steel fork might suit your needs, but I would suggest checking with Thorn (SJS Cycles) before purchase...

https://www.sjscycles.co.uk/forks/26-inch-thorn-mt-tura-1-18-inch-ahead-80-100-mm-suspension-corrected-fork-matted-black/?geoc=US

The Enduro frame was equipped with an ISO mount for a rear disc brake. You might well be able to run a 27.5in/650B wheel on the rear depending on tire size (larger in diameter). I don't think you'll have any tire clearance issues at the seatstays, but the converging chainstays could be problematic as the tire gets closer to the bottom bracket.

The Thorn My Tura fork I linked to above is *not* disc-capable. It uses canti/v-brake studs (on the rear of the blades) sized for 26in wheels. If 650B wheels are important, you might wish to look at another fork *or* check out v-brakes with longer than usual pad slots.

Best, Dan.

[EDIT: If you wish to see a nice example of an Enduro build, see...
https://thorncyclesforum.co.uk/index.php?topic=12227.0 ]
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Thorn General / Fork for Raven Enduro?
« Last post by Mikkel on June 11, 2026, 08:26:52 PM »
I recently acquired a Thorn Raven Enduro MTB frame, size 589L.

I am now looking for a suitable rigid fork for an all-year city commuter build.

Any good suggestions? Carbon or steel?

Also, would it be possible to fit 27.5" wheels on the frame?

Best wishes and happy trails
Mikkel from Denmark
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Thorn General / Re: Mercury 40
« Last post by rualexander on June 09, 2026, 05:59:20 PM »
😴
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Thorn General / Re: Mercury 40
« Last post by Andre Jute on June 09, 2026, 02:33:39 PM »
Perhaps it’s simply a case of business realities.

Probably

Oh, I think we can take that as a 99% certainty. Here are just a few costs associated with such an efflorescence of models and fits as offered by Thorne while Andy Blance was their designer, all of which I knew about before I went to business school:

Cost of capital (interest, repayments of loans cutting into distributable profits) to finance so large a range, warehousing space built or rented, sales lost because a large range of sizes and fits and models must be compensated by reduced colour range which is arguably more important to the vast majority of bicycle purchasers, time to train customer-facing staff in so large and varied a range, multiplication of showroom fit-out of so many models meaning larger stocks of expensive parts. The absolutely brilliant 100 days free trial also brought costs to the vendor, as well as welcome buzz on the internet. We also saw some of the fits at the margins being offered well after the main body of the production was sold, often at bargain prices; these discounts are an additional cost of so large a range.

On the other hand, you might say that the two main ranges established Thorn with a bang as a premier manufacturer of touring bikes after making custom bikes ran into a brick wall of costs and Far Eastern competition, and very likely brazier staffing problems too. (A quarter century ago already, when I drew a design for a custom bike built of triangulated small tubes, I couldn't find anyone except art school welders and silversmiths-- Jesus help me! -- to braze it together for me.) Thorn wouldn't be THORN today without all that; it might not be more than a fringe curiosity, as so many of the once famous custom builders in Great Britain have become. Whichever way you choose to do it, it is expensive to establish a mainstream brand, and niche brands perversely cost more to establish.

There is a time to take such a risk, and pay its costs, and inevitably a time arrives for consolidation and rationalization.

***
It's worth saying that this is a standard business school (or at least good, meaning non-political, business school) applied micro-economics analysis: in short, a point well understood would arrive where the owner of the business would have to make some unavoidable hard choices. 

Personally, I came to appreciate Thorn's exquisite care for the fit of their riders after Sheldon Brown drew my attention to it, and to Mr Blance's insistence on the best value, long-lasting component choices which would least often immobilize the tourist in some godawful place.* Getting on for twenty years later I see no reason to change my mind about either early impression.

*In Oz you get a choice between 'The Pub With No Beer' and 'The Fatal Wedding', the latter 114 stanzas that start, 'The Hearse Overturned At The Crossroads.' You shoulda stayed in Melbourne: at least there you can get a 'Floater' from the cart at the bottom of Spring Street, which is a meat pie in a bowl allegedly of pea soup, and the only danger is the tram lines bending your rims as it they cast you onto the tarmac.
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Finally got this listed on ebay:

https://www.ebay.co.uk/itm/298396749429
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Thorn General / Re: Mercury 40
« Last post by rualexander on June 08, 2026, 05:41:15 PM »
Perhaps it’s simply a case of business realities.

Probably

Going from imron back to powercoat doesn't seem like such a step down in an era, when frame-protection tape is so common in the bicycle world. Primarily favored by bikepackers to avoid bag-rub, but it’s not as if there are any downsides to using it even if one doesn’t have such bags.

My Nomad Mk2 frame is powercoated and even unprotected by tape, and used now as a local-use bike in a wet climate. I can't say the paint seems particularly more vulnerable than my imron Nomad Mk3 frame.

Frame tape is fine in the obvious areas but it won't wrap around bottle bosses, cable guides, and rack mounts, which in my experience with my Thorn bikes are areas which start to rust and from where it creeps under the paint and can start to bubble.
Maybe the Thorn paintwork has improved since I bought mine. But I liked the idea of the more durable Imron paint and stainless steel fittings.
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