We don’t yet know the exact details of the new standards but Challenge reveals the update to the guidelines stipulates a minimum 0.7mm rounded radius on all hooked rims.
Challenge claims that Enve SES carbon rims do not comply with this updated standard, having “two sharp 0.2mm radii in their hooks that leave parallel cuts above the bead”. For this reason, Challenge does not recommend using its tyres on Enve rims.
Challenge has noted failures of its clincher tires, communicated by consumers and athletes, caused by the sharp edges on the ENVE SES hooks. This international design standard violation has been communicated back to the affected consumers, shops, endorsed teams, ENVE and their parent company, as Challenge has been made aware of problems. ENVE, however, continues to produce and promote usage of the said SES models, as part of their line.
Challenge has consequently been forced to list the specific ENVE SES rims as not compatible with any Challenge clincher tire models, on the website. Challenge asks that consumers do not mount ENVE SES wheels with any model of Challenge clincher tire whatsoever.
Failure to follow this warning could cause the ENVE SES wheel to cut Challenge’s quality casings resulting in explosive air loss from the tire and/or inner tube, potentially causing a crash and injury to the rider.
This bulletin also aims at providing the technical clarification, that only a precisely defined 622.0mm+-0.5mm bead seat diameter, specifically defined wall height and center channel, as described in the new above standards, will safely and easily allow proper tire and rim fit and function. Challenge has regularly been attending standards meetings and being involved for the past three years in confronting the market’s accelerated changes, such as the implementation of progressively wider rims, carbon fiber clinchers rims and tubeless and tubeless ready tire technologies. Challenge has invested time, knowledge and energy together with other elite bicycle industry companies to address and update tire & wheel fit issues with the ETRTO and ISO.
Challenge handmade tires have been produced for close to 20 years using the same handmade processes that have been proven over the past 50 years at the highest levels of racing without significant failures - if the rims and wheels comply with internationally accepted design standards. And this applies for both aluminum and carbon fiber rims.
Regarding carbon fiber rims, there had also been other periodic problems in the past with some carbon rims that had cut our (and other tire manufacturers’) tire casings just above the beads. These tire cuts were however normally caused by less than optimal QC at the factory, resulting in quality issues of improper finishing at the tire hook during production. Normally roughness at the hook was due to failure to completely remove resin flashings created while molding the rim. Proper finishing leaves the required 0.7mm min. radiused rim hook smooth, without roughness, thus eliminating a potential tire failure.
In the above cases, Challenge has routinely and successfully worked with the wheel suppliers (including ENVE) to fix the problems or replace these wheels to the consumer. However, specifically with ENVE’s SES model wheels, it is the first time that Challenge has known of a rim hook design that does not meet the above recognized design criteria, reason for which Challenge feels compelled to follow up with the release of this informative bulletin to protect its customers
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19 comments
I've never heard of a graduated driving licence, so thanks to CUK and road.cc for making me aware.
The worst drivers are the entitled teenagers who think they know it all because they've just passed their test, so restricting them until they've gained experience has to be good for everyone, especially vulnerable road users.
I do agree with the GDL recommendations in the report, however I would be inclined to go even further. Restrictions on the type of vehicle that you are allowed to drive being my main objective. New drivers of say less than 6 months experience may only drive vehicles up to 1200cc. After 6 month probationary period a new licence allowing this restriction to be relaxed to 1600cc for a further 6 months. then 1800cc, 2000cc etc.
My reasoning being that they cannot just jump into the parents powerful automobiles until after a reasonable amount of time honing their driving skills on a compulsory Green P plate and/or getting a second hand hot hatchback blinged, pimped and souped up to race around in.
But your theory is a bit flawed in that limiting the cubic capacity won’t necessarily mean the car isn’t as/ too powerful compared to one with a larger cc. There is a 3 cylinder 1ltr Fiesta that pumps out 100bhp....
PP
But your theory is a bit flawed in that limiting the cubic capacity won’t necessarily mean the car isn’t as/ too powerful compared to one with a larger cc. There is a 3 cylinder 1ltr Fiesta that pumps out 100bhp....
PP
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Hi PP, I guess that there is a flaw in the theory of just limiting the cubic capacity, so as allured to in my previous post, more restrictions on the type of vehicle; and not just the cc. For example, not allowed to drive a 3 cyclinder 1ltr Ford Fiesta that pumps out 100bhp (or similailar models)
And formula 1 cars of the '80's pumping out 1000 BHP out of 1500 cc turbo charged engines
What may be more realistic is to limit them to unmodified cars, that according to the manufacturer's information are eg 100 bhp then 150 bhp or similar.
The problem is that those who don't have a license will still go out and drive, usually more recklessly, as have appeared in quite a few news stories over the last year or two.
And while many new drivers are reckless, there's also plenty of drivers out there who have had a license for 15-20 years who drive appallingly, just because they can now afford something that flatters their driving ability like an Audi or BMW and allows them to drive more quickly than they would be able to handle in certain other cars. This seems to lead to them taking greater risks and making poor judgements.
Don't forget all those who will go out and get a surprisingly powerful motorbike on 'L' plates, and then never quite upgrade it to a 'full' licence...
Graduated car licences will, almost certainly, never catch on - families will claim (despite any reality) that they can't afford to pay for repeated tests/own and run/space to keep a small car for the new driver in addition to the parent's powerful cars. It is the insurance premiums on powerful cars for young drivers that are effectively doing this job already. Those that don't care about insurance certainly won't care about licences.
Motorbikes, however, are much more restricted by law based on age, licence and power, but it's usually very easy to bypass/disable the restrictor kits on bigger bikes which is sometimes just a washer restricting the air intake.
If you don't upgrade your licence to a full one, you have to re-do the CBT every 2 years (unless you're riding a 50cc moped on a very old car licence).
Graduated car licences will, almost certainly, never catch on Except that it has been successfully applied in a number of countries in one guise or other.
It is the insurance premiums on powerful cars for young drivers that are effectively doing this job already. Good point
Here in our nanny state of Victoria, Australia, we have graduated licences for new drivers called a Probationary licence for 3 years. For the 1st year it has restrictions such as not driving with any passengers under the age of 25 (I think), not even carrying a mobile phone in the vehicle in the 1st year and also vehicle restrictions based on a Power to Weight ratio.
bl**dy Edge...
double post
New Zealand introduced this in (?) the early 90's. Was instrumental in halving the road toll of people under 25 (and contributed along with other measures to a halving of the road toll generally).
Ermm, there'a already miles of cycle paths around the Nissan plant, I use them every day. Not crap ones either, they're wide enough to squeeze past the HGVs that use them as a parking lane for overnight stops
Police car is parked on double yellows, and with wheels on the pavement. Wonder if they gave themselves a parking ticket?
I rate this 99
Will this help when Brexit causes the factory to close as Nissan move production elsewhere?
"Chancellor Philip Hammond's Spring Statement featured £10m of funding for improvements to cycleways and bus routes across the North East."
While we can all welcome investment into cycling, let's put this into context, and laughable doesn't really do it justice.
Instead of a comprehensive, clear, properly funded investment programme for cycling, the "government" grudgingly give us back a crumb or two. They have huge plans for road and rail spending, but cycling, the best value transport investment gets almost nothing. Transport policy is worse organised than Brexit, and always has been.
Laughable? Pathetic, miserable, ultra-shambles is a better description.
Translation: Please, O God, please don't close the factory!!!