Tyranniux

well ive finally killed my beloved Boyds :-(

Rode out to watch what has to be the best cycling event on the calendar, the now infamous Tour de Yorkshire, and descending a fairly steep road into a small village I witnessed a shotgun deflation on the front, this was the result.

RIP my trusty 58's

texaspandj

More like Rest In Pieces. Yikes, at least you're ok.

Tyranniux

Exactly my thoughts, they have done me good service in fairness but a shame all the same, they do roll very nicely (or did). It still managed to get me home too, just had to walk down the hills which I was getting some looks for!

I cant believe i managed to stay upright considering what hapenned. had to stop from around 25mph riding literally on the carbon rim seeing as the tyre had jumped ship. Arse was nipping a bit at that point!

cyclebycle13

How long did you have them? (years/miles) Knowing how Boyd runs the business, they might offer you some kind of replacement deal.

Tyranniux

3 years ish and probably about 4k. for past 2 years they have been my race wheels but have used them for general riding since about feb this year. I wouldnt expect anything, as I said they have done good service, I have a set of 303 Firecrests (2016 model) and some Mavic Ksyrium SLRs for race duty now depending on terrain so just need some training / general riding wheels, Ill probably go with some Fulcrum 5 LG seeing as Im in the UK.

garysol1 

Can you share with us what brake pads you used? Did you use the same pad for both your Mavic's and the Boyd's? Maybe we can all learn something here...... maybe not.

noodle soup

Only 4k miles of use? Yikes.

rpenmanparker 

I'm uncertain what you are saying actually happened, i.e. what was cause and what was effect. Are we talking about a tire failure that lead to rim damage or a rim failure that caused the tire to unmount? Or a mixed situation like overheating that softened the rim and caused the tire/tube to blow and then the soft and naked rim was damaged on the road? If the tire started it without it being due to overheating, it isn't the fault of the rim; that was just collateral damage. If the rim failed cold first and allowed the tire to unmount, I would say you have a claim on Boyd. Same if the rim failed hot.

In any case I'm glad you could manage the situation and stay upright.

deapee

Wow...glad you're ok -- that being said, there could have been a crack in there that weakened the structure. Something so small that you wouldn't notice it unless you really inspected it. The crack could have been there for a day or a while. Something made the tire structurally not sound.

AlmostTrick

Glad you weren't injured. Now you can get some nice aluminum rims and enjoy better braking and less chance of random rim failure.

Bah Humbug

Very glad, of course, like everyone else that you managed to keep it upright! Interested to hear if we ever find out what exactly happened...

Maelochs

rpenmanparker asked exactly the question I wanted to ask: what actually failed here? Liability aside, I want to know if this is a case of carbon rim failure or tire failure, and whether or not (if it was rim failure) it was caused by heat or whatever else.

Glad you survived and all that, but from the picture and the story, I cannot tell ... it seems like the tire blew and then all the rest, but I need more facts before I can draw a completely biased conclusion to either champion or attack carbon, depending on my own prejudices---just so I can pretend that I am honest and scientific..

rms13

I thought only Chinese carbon assploded

Campag4life

OP...glad you are OK. Lots of Boyd owners on this forum who are curious.
Did tire/rim fail after riding the brakes hard down the mountain aka heat may have degraded your rim strength? Also type of pads used would be helpful knowledge.

Trsnrtr

And what PSI have you been running?

I've had aluminum rims crack like that from running overinflated tires on my tandem.

popeye

It's hard to tell what failed first. I would like to see the undamaged brake track and what pads where used. I have 15-20k miles on 4 YO Boyd 50/58's using BP pads no worries but I'm a fair weather rider and light weight and love to go fast down hill.

Lazyass

Why would you think it was a myth when there's been countless examples?

BillyD

Don't start. You know why. It's just semantics. Some folks believe one thing, some folks believe another. Simple.

We can leave it at that. Nobody's personal opinion is going to change, we already know that.

Mike F

Hopefully you dont have a potbelly

redfooj

my chinese rims havent exploded

;knock on carbon:

texaspandj

I'm curious whether OP will buy some more carbon wheels to train on or not and will it affect him pychologicaly?

FBinNY 

It's entirely possible that you have the cause and effect backward. While the rim might have failed from flange/brake wear causing the blowout, it's equally possible that the tire blew first, and the damage is from riding the rim as you were slowing down.

Don't have an opinion either way, just saying things aren't always as clearcut as people believe.

Tyranniux

sorry for late reply for those asking questions above, ive just been watching the TDY come through the village.

I suspect that the heat build up caused both the delamination and the tyre blow out at the same time, the damage caused isnt from it running on the concrete thats for sure. The rim showed signs of wear but definitely not a delamination before the ride. tyres are almost new (1000 miles or so) Schwalbe one 25mm with normal butyl tubes (conti I think), pressure was 90psi in front.

just to clarify to those saying things about liability or claims etc, im not looking for any particular resolution here, and certainly not placing any blame, sure I think an alu rim would have coped just fine but like I said the wheels have done some hard miles so im not complaining, especially seeing as I stayed upright!

I always used the Boyd pads from day 1 with these rims so should have been optimal conditions, and it was a cold wet day. ill post a pic of the other side of the rim that hasnt failed if youre interested. I may have underestimated the mileage on reflection, maybe more like 6-7k on them, a few k racing on them. I am 88KG btw so this may have been a contributing factor.

Tyranniux

nah, im as daft as they come, if I ever thought about stuff like that Id never hit 50+ mph again! I use the 303's for racing so carbon is all good with me.

rms13

I feel like that is the case with most carbon clinchers with tubes. You can get a lot of heat build up braking and if you are descending a lot and/or riding the brakes too much heat build up can blow out the tube and then damage the rim from riding on it while stopping. It's the chicken and the egg