Bernard Kerr just snapped the front off of his prototype Pivot at Crankworks. I couldn't see if it was the lug or the carbon.
Snapped near the head tube. Tried to triple some jumps but came up short, 50/50'd the landing. Bummed to see that. I was really hoping for him to do well here.
Generally alignment fixtures and measuring equipment are placed on a large precision ground slab on a precision adjustable fixture.
I've never checked if the one in...
Generally alignment fixtures and measuring equipment are placed on a large precision ground slab on a precision adjustable fixture.
I've never checked if the one in my office is made of marble or another type of stone.
Granite, I would expect. Marble is too soft and chemically reactive.
The Frameworks DH bike blows away any DH bike I have tried. I was very happy with the Phoenix and I’m a huge fan of Pivot...
The Frameworks DH bike blows away any DH bike I have tried. I was very happy with the Phoenix and I’m a huge fan of Pivot in general. Unfortunately it isn’t comparable. The Frameworks bike, even though I set it up as a hybrid Enduro bike, is night and day better.
Damn, this build is so sick!!! I would love to try one.
Pic of BKs bike for anyone that didn’t see the replay
Pic of BKs bike for anyone that didn’t see the replay
There are videos on insta which show the frame close-up. Looks like a de-bond, the curved section is intact and full of dirt. Hopefully no serious injuries, nightmare crash.
best angle I’ve seen of it. Watching it live the case didn’t seem that bad, however from this angle, maybe not every bike would have snapped, but it was a pretty big impact.
It would have been an interesting situation if it happened during quali.
Would Pivot recalled the other proto and put their team on the old frame.. not a good look for the proto, but putting their athlete at risk is not a good look for the team either.
With how all the epoxy has stuck to the carbon tube, I would have to assume the epoxy failed due to galvanic corrosion which is one of the bigger benefits of using titanium and carbon or aluminum and aluminum such as Atherton are doing. With proper isolation of the aluminum with anodizing or plating then an even glue line with bond spacers a joint shouldn't fail within a year. Those epoxies are strong as hell. Maybe they need to revisit the length of lap the are using.
More info on the Atherton A-170 here:
https://www.athertonbikes.com/aluminium-atherton
7075! Which is quite good, apparently
Oh and Gee on one that has Trickstuff brakes on it:...
Oh and Gee on one that has Trickstuff brakes on it:
Good to see they're sticking with double lapped lugs on the new frame.
I'm glad the mentioned forging, I was wondering if you could cast the parts and then machine the surfaces after, but I guess getting quality high resolution casts is such a niche thing anyway it was probably just as expensive for lower quality
best angle I’ve seen of it. Watching it live the case didn’t seem that bad, however from this angle, maybe not every bike would have snapped, but it was a pretty big impact.
If you watch this closely, his front wheels squirms in a real weird way right before he pulls. Maybe a rut or mud, but kinda looks maybe it was going before that case.
Not sure if this is the right place to share but here's a couple thoughts/rumors on random bike stuff after attending the Sedona bike fest
1...
Not sure if this is the right place to share but here's a couple thoughts/rumors on random bike stuff after attending the Sedona bike fest
1. All the guys that brought their DJ and bmx bikes lost to a guy that was on a demo yeti sb135 for the bunny hop contest. It's the rider, not the bike.
2. Always wondered what gearbox bikes felt when you tried to shift underload - it doesn't shift! I was climbing a not very steep road to get back to the venue on a (demo)Zerode and was stuck in gear 4 all the way up. The grip shift just would not budge until I completely stopped pedaling. I think there's still some improvement to be had there. The guys at the booth said the back wheel should track better due to being lighter, I personally could not tell. I did miss the ability to shift under power though.
3. The TRP DHR evo brakes felt wildly different from the Hayes Dominion A4s. I have the Hayes, and they have a super defined bite point. The TRP levers are also light action, but the braking feel is much more linear than the Hayes. Also, the Hayes felt like they had much more stopping power. Just my thoughts, as I see these being compared to each other a lot all around.
4. Heard that EXT is releasing a DC fork within this year.
5. There were SO many people demoing Yetis. Not sure because of the appeal or maybe just because they have the largest demo fleet. Norco only had 1 size of each bike.
6. Tried pulling the maven levers (on someone's bike, with consent), they are pretty stiff. Friend who has Codes are actually pretty excited for them, me not so much. My hunch is that if you liked Codes and you need more power, you'll like Mavens. If you didn't like Codes to start with, Mavens probably won't change that.
7.Saw some kids with older hardtails having great fun on Hiline. Anytime on a bike is better than being on a couch.
Regarding gearboxes, with the Pionion it's known you have to let up on the pedals to release the shift mechanism. On their end of line check...
Regarding gearboxes, with the Pionion it's known you have to let up on the pedals to release the shift mechanism. On their end of line check in the factory apparently they shift under full power, but drive the shifting mechanism with a big motor. So the design/parts take it, you're just not strong enough with the gripshift to shift it.
I think the electronic shifting mechanism improves in this.
With effigear talking with the designers they used direct drive hubs in order to drive the gearbox forwards with the wheel during shifts in one of the directions to release the pawls. Using a freehub rear hub would otherwise require backpedaling to release the shifting mechanism and enable the shift to be made.
Actually got to ride a Kavenz with an Effigear yesterday. Having to stop pedalling to achieve a shift to a lighter gear is weird. I guess you'd get used to it but the parking lot test just makes you think the gearbox doesn't work as it keeps the same gear until you let up on the pedals. The guy even had the the chainring on the freehub ziptied to the spokes so the wheel drives the chain to make shifting easier. Without it he would have to backpedal to change to a lighter gear.
Perhaps Pivot would benefit from the double lap shear design that Atherton uses.
Think this is the same frame he’s been on for a year now...
Perhaps Pivot would benefit from the double lap shear design that Atherton uses.
Think this is the same frame he’s been on for a year now? That’s a lot of laps.
BTW I’m a Pivot fan and a big fan of bonded frames.
Wonder if the curved downtube is needed for assembly? Seems like it would be harder to pull apart if the tubes were angled apart.
I love being an internet engineer 😜
The double lap joint is there to ensure a correct application of the adhesive. If you apply it into the groove and push in the tube, the tube will likely be wetted (and this glued) all around the circumference both inside and outside the tube. With a single tube in a single tube it's possible to just scrape off the glue by pushing the tubes together.
What do you guys think of Rulezman's zero pedal kickback idler pulley design? It only works with Banshee V3 frames and is mounted to the iscg-05 tabs, but I honestly would want one on my bike despite having a bit more drag when pedaling. It seems to do exactly what an Ochain is trying to accomplish but for much less money. If only there was someone out there who could desgin one for different bikes.
So...I can't search 20+ pages of data. The one post where you guys posted the review of the Maven's where the guy basically concluded they were awful & he couldn't get a gorilla to actuate the lever.....was he the only one?
With how all the epoxy has stuck to the carbon tube, I would have to assume the epoxy failed due to galvanic corrosion which is one...
With how all the epoxy has stuck to the carbon tube, I would have to assume the epoxy failed due to galvanic corrosion which is one of the bigger benefits of using titanium and carbon or aluminum and aluminum such as Atherton are doing. With proper isolation of the aluminum with anodizing or plating then an even glue line with bond spacers a joint shouldn't fail within a year. Those epoxies are strong as hell. Maybe they need to revisit the length of lap the are using.
I doubt it’s galvanic corrosion, I would bet money on it that the aluminum oxidized and wasn’t treated before they applied the adhesive to the substrate. There could be saponification happening, but usually that only happens with some amine compounds when interacting with a substrate containing zinc, so I highly doubt that’s the case.
A common misconception is that aluminum doesn’t oxidized, but it actually oxidizes (depending on the alloy) within minutes when exposed to oxygen. Anyone familiar with bonding aluminum should be well aware of this. We glue exotic road cars and race cars together all day with no problems. Devils in the details.
photo looks like epoxy failure between the two materials
Snapped near the head tube. Tried to triple some jumps but came up short, 50/50'd the landing. Bummed to see that. I was really hoping for him to do well here.
Granite, I would expect. Marble is too soft and chemically reactive.
It's usually granite yes.
Damn, this build is so sick!!! I would love to try one.
Pic of BKs bike for anyone that didn’t see the replay
There are videos on insta which show the frame close-up. Looks like a de-bond, the curved section is intact and full of dirt. Hopefully no serious injuries, nightmare crash.
Ah. Just needs some Gorilla Glue and he will be back at the next race no problem.
More info on the Atherton A-170 here:
https://www.athertonbikes.com/aluminium-atherton
7075! Which is quite good, apparently
Oh and Gee on one that has Trickstuff brakes on it:
Thanks!
Didn't watch - was this one of those impacts that would've broken any bike no matter how its was constructed? I heard it was a cased triple attempt.
https://www.instagram.com/reel/C4m30HqtdLk/?igsh=MzY1NDJmNzMyNQ==
best angle I’ve seen of it. Watching it live the case didn’t seem that bad, however from this angle, maybe not every bike would have snapped, but it was a pretty big impact.
Perhaps Pivot would benefit from the double lap shear design that Atherton uses.
Think this is the same frame he’s been on for a year now? That’s a lot of laps.
BTW I’m a Pivot fan and a big fan of bonded frames.
Wonder if the curved downtube is needed for assembly? Seems like it would be harder to pull apart if the tubes were angled apart.
I love being an internet engineer 😜
It would have been an interesting situation if it happened during quali.
Would Pivot recalled the other proto and put their team on the old frame.. not a good look for the proto, but putting their athlete at risk is not a good look for the team either.
So the tube pulled out of the lug?
that screenshot is hilarious lol.
With how all the epoxy has stuck to the carbon tube, I would have to assume the epoxy failed due to galvanic corrosion which is one of the bigger benefits of using titanium and carbon or aluminum and aluminum such as Atherton are doing. With proper isolation of the aluminum with anodizing or plating then an even glue line with bond spacers a joint shouldn't fail within a year. Those epoxies are strong as hell. Maybe they need to revisit the length of lap the are using.
Good to see they're sticking with double lapped lugs on the new frame.
I'm glad the mentioned forging, I was wondering if you could cast the parts and then machine the surfaces after, but I guess getting quality high resolution casts is such a niche thing anyway it was probably just as expensive for lower quality
Loam Wolf video of Pivot proto manufacturing.
rocky undercover at the windrock enduro
If you watch this closely, his front wheels squirms in a real weird way right before he pulls. Maybe a rut or mud, but kinda looks maybe it was going before that case.
Socky Mountain
New pullout king on the scene
Do we have a date
Actually got to ride a Kavenz with an Effigear yesterday. Having to stop pedalling to achieve a shift to a lighter gear is weird. I guess you'd get used to it but the parking lot test just makes you think the gearbox doesn't work as it keeps the same gear until you let up on the pedals. The guy even had the the chainring on the freehub ziptied to the spokes so the wheel drives the chain to make shifting easier. Without it he would have to backpedal to change to a lighter gear.
The double lap joint is there to ensure a correct application of the adhesive. If you apply it into the groove and push in the tube, the tube will likely be wetted (and this glued) all around the circumference both inside and outside the tube. With a single tube in a single tube it's possible to just scrape off the glue by pushing the tubes together.
What do you guys think of Rulezman's zero pedal kickback idler pulley design? It only works with Banshee V3 frames and is mounted to the iscg-05 tabs, but I honestly would want one on my bike despite having a bit more drag when pedaling. It seems to do exactly what an Ochain is trying to accomplish but for much less money. If only there was someone out there who could desgin one for different bikes.
So...I can't search 20+ pages of data. The one post where you guys posted the review of the Maven's where the guy basically concluded they were awful & he couldn't get a gorilla to actuate the lever.....was he the only one?
I doubt it’s galvanic corrosion, I would bet money on it that the aluminum oxidized and wasn’t treated before they applied the adhesive to the substrate. There could be saponification happening, but usually that only happens with some amine compounds when interacting with a substrate containing zinc, so I highly doubt that’s the case.
A common misconception is that aluminum doesn’t oxidized, but it actually oxidizes (depending on the alloy) within minutes when exposed to oxygen. Anyone familiar with bonding aluminum should be well aware of this. We glue exotic road cars and race cars together all day with no problems. Devils in the details.
https://www.instagram.com/reel/C4nWS3yMdNv/?utm_source=ig_web_copy_link
The pressure.police wins the internet today
RIP John Clarke