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earleb Added a reply to MTB Tech Rumors and Innovation
7/6/2025 10:22am I think Jackson is on a medium these days. Seems that would be the right size not a size up for him? Would love so see someone create a database comparison with riders height and bike dimensions.
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earleb Added a reply to 2025 World Cup Downhill - La Thuile, Italy
7/4/2025 2:25pm Looking forward to seeing how that goes.
earleb Added a reply to 2025 Race Talk
7/4/2025 12:08pm Megavalanche is this weekend. https://www.ucc-sportevent.com/en/megavalanche-alpe-dhuez-en/ Here is the start list for the final. https://timingzone.com/magavalanche-alpe-dhuez-2025/#1_16A21B Kilian Bron is usually a top contender and had a crash in qualifying so starting in the 4th row. That should make for some wild helmet cam action of lots of passing. Macky of the youtube pair Sid n Macky is in the 7th row. Last...
earleb Added a reply to Frame Design
7/1/2025 8:42pm Why a machined chainstay vs tube and machined bits?
earleb Added a comment about bike check DSASTR Titanium Enduro bike
6/30/2025 9:57am
Beautiful work.
This bike check has 4 comments.
1llumA Liked a reply to forum topic The Bikeconomics (Mega)Thread
6/27/2025 9:35pm
The conclusion of this memoir points out the machine they made is not really up for industrial production capacity and they had issues with inside lubrication. They also didn't test with 6061 which is what Devinci currently use. My guess by looking at current chainsaw, troy gen5 al and e-troy lite, that are the most recent made in Chicoutimi frame, is the seat tube with the rocker axle would be the main part that is hydro formed and the battery cradle for the e-troy. The rest look to be relatively simple tubes forms that local supplier should be able to...
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earleb Added a reply to The Bikeconomics (Mega)Thread
6/27/2025 5:12pm How is your French? https://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QQLA/TC-QQLA-… DEVELOPPEMENT D'UNE MACHINE POUR L'ÉTIRAGE À FROID DE TUBES D'ALUMINIUM 6063 À ÉPAISSEUR VARIABLE A research paper between University Laval, Devinci, and Alfiniti to build custom cold draw bench for butted 6063 tubing.
earleb Added a reply to The Bikeconomics (Mega)Thread
6/27/2025 4:14pm Just remembered this. Litespeed has a draw bench they still use to custom draw their own tubing. https://www.youtube.com/watch?v=3X6wb_neCD8
earleb Added a reply to The Bikeconomics (Mega)Thread
6/27/2025 12:57pm I realize that there is no domestic supply for bike tubing. At the size and location of Devinci I would expect they can have their own tubing drawn locally by a company like Alfiniti. Quebec produces 4% of the worlds aluminium (70% of North American) and has significant resources there locally in the region for aluminum post processing.
earleb Added a reply to The Bikeconomics (Mega)Thread
6/27/2025 12:14pm I have no idea. I would think that the tubes are drawn and hydroformed locally. It doesn't make sense to make any claims about being near the source of aluminium production but ship the in process materials around the world before welding up a frame. I could see the forgings coming from Asia. I know some local guys were just...
earleb Added a comment about bike check Devlin Jester Enduro Race 480
6/27/2025 9:59am
So many great fine details on this. The colour isn't my jam but it's a beautiful bike.
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This bike check has 7 comments.
earleb Added a reply to MTB Tech Rumors and Innovation
6/26/2025 3:40pm Close...but these are a new 36.5 mm stanchion fork. It's half way between the 38 Zeb and the 35mm Lyrik. And yes they are going to call it the Totem.
earleb Added a reply to MTB Tech Rumors and Innovation
6/26/2025 12:52pm Kids ebikes. The end if nigh.
earleb Added a reply to 2025 World Cup Downhill - Val di Sole, Italy
6/23/2025 12:29am How about the days of Freecaster.tv? Or we back to recording races from OLN on VHS? Or back to waiting for the next month's edition of MBA to come out to see who was winning at the races. You kids don't know how good you have it.
earleb Added a reply to 2025 World Cup Downhill - Val di Sole, Italy
6/22/2025 4:30pm Sooo good.
earleb Added a reply to The flex stay discussion thread
6/22/2025 9:46am Vertical compliance in a hardtail road or MTB is a myth. It doesn't happen on any real world measurable amount. On a hardtail and flex felt is coming from the seatpost. Here is some analysis for you to dig into. https://www.albatrossbikes.com/projectgallery/2020/12/17/dropped-stay-c… There is more out there if you go looking. Rob English frame builder and engineer has discussed it on...
earleb Added a reply to The flex stay discussion thread
6/21/2025 11:09am Also to add for the seatstay in a flex design to buckle something else has to also give. The chainstays in tension would need to stretch/bend or something at the other end needs to move (rocker,top tube rocker mount, shock mount, top tube flex). No one thing can move in isolation without something else in the chain moving.
earleb Added a reply to The flex stay discussion thread
6/21/2025 10:42am Rigid bike flexing vertically doesn't happen. It's a triangular structure, in order for the seat stay to flex you would need either the seat tube or the chainstays to also flex and force needed to bend those is huge.
earleb Added a reply to The flex stay discussion thread
6/20/2025 4:01pm The seatstay is flexing forward of the riser at the dropout. This is where a pivot bearing would be if it wasn't a flex design. The one thing to point out is that the seatstay doesn't likely have this much visual deformation when it flexes. The CAD simulation will have a deformation scale, this exaggerates the visual of how much...
earleb Added a reply to The flex stay discussion thread
6/20/2025 1:59pm The Busby patent for dorks like me that were curious about it. https://patents.google.com/patent/US6092823A/en