...Your not the only one mate
Here's some food for thought capt safety!
It IS perfectly legal to do this (So WOF & Insurance are actually covered...or the work mate wouldn't have got paid out when he was smidsy'd last year)
Its a proven practice globally that has its proven merrits, but naturally, the practice does! require some homework into what tyres suit, what the effects are, and if this practice suits the type of bike and riding style etc (Obviously you don't do this on a R1! and obviously you don't just chuck any car tyre on and pray it works!)
But most actually do this because Bike tyres are NOT perfect in the crusier world...lets look at why ALOT of people around the world do this.
..honda gold wing!...lets use that common heavy crusier as an example.
Goldwing weight- Aprox 800lbs (with out rider an passenger)
The RECOMMENDED motorcycle tyre has a max load weight of....992 lbs!
-now add a rider...passenger....gear!.....see the problem with the $600-$800 "recommended" tyre??
...just jump on any goldwing or heavy cruiser forum...look up 'TYRE BLOW OUT"...there's multitudes of posts proving that the factory tyre just is not up the job, and is actually more dangerous than the option of darksiding!(If done properly!)
Hence, due to obscenely heavy crusiers chewing through rediculasly expensive "factory" tyres (As mentioned in the OPs posts) and multitudes of blow-outs occuring for "sticking to the factory recommendations"...darksiding was born as an option for these heavy cruiser riders.
...But I totally agree that it CAN be dangerous(And understand your reluctance to issue WOF's or fit them...thats personal choice and high eithical standards!

)...but!, with the correct amount of reasearch into what tyre will suit your bike and do the job as safely as possible, you can reduce the risk of trying darksiding, and even possibly reduce the chances of a blow out or tyre failure, reduce the cost of replacing expensive factory rubber, and all with minimal risk to the rider under normal road use.
...if its safe, proven to work, save's you money and you accept the risk in doing this sort of "mod"...why not investigate the validity of doing so? (which is what this thread is all about...seeking information and opinions...not angry Coffee deficient attitudes from those within the industry**)
**The very same people that used to tell riders that if you use ANYTHING!! other than factory parts or DARE to modify your bike...you are "risking your personal safety...blah blah blah!!"...REALLY??...or is it just a great way to ensure sales of expensive "factory recommended parts"?
...If you do a search online, you can see the HUGE argument over this practice between the industry etc & the riders actually doing it!...but the fact remains, its a practice that has been going on for many many years!...and yet, there are not many stats available in regards to accidents or deaths resulting from darksiding...and that says alot! in a world that loves shoving stats down people throats! - if there was a problem with the practice of darksiding...the authorities would ensure those stats where there to back up there "safety" argument...and yet, thousands of riders around the world are doing this on a daily basis...so again...safety issue?...or is it also a lost profit issue within the industry?
As always KM, respect ya personal & professional opinion

...but end of the day its just YOUR opinion on the subject, that has no statistical backing or personal experiance to back it up...Im all for exploring & researching new possible options and hearing the opinions of others.
Ride safe mate
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