Mod-Master
Cannondale Fan
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I have to say, this is the most tasteful restomod I’ve ever seen. I love it.
(Especially the carbon cage)
(Especially the carbon cage)
Retro-modern fusion gravel build madness. The new Superb!
- Thread starter M_Chavez
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In my defence, that was the only rear mech I had that was a plug & play into Shimergo drivetrain.
But hey, you don't just get 11.5kg without saving some serious weight with carbon fibre, right
grantoury
Kona Fan
I like how the old girl looks. But the cantis, they are not actually functional from the looks of it. If it were me, I would try another pair. I suspect because these are cyclocross specific brakes, there is a large area between the wheel and the brakes for mud buildup. It is the only thing I can think of, looking at that. Something like the Dia compe dc980 may do a better job, perhaps. @Woz may know a solution.
Mod-Master
Cannondale Fan
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I've posted some links to calculating the cantis a few pages ago - they work a bit better than they look (essentially, in such upside-down mode they work as if they had shorter lever arms...therefore reducing mechanical advantage and making the brakes a bit spongy.
Pad alignment is the biggest issue here I think.
If I install used pads into them, that will make things better, and the arms will assume a more natural position - my problem is that with my current rim there's just no space for pads.
Definitely something to fanny with in the coming months, but for now I just want to finally put a few miles on the bike.
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grantoury
Kona Fan
I didn't read the whole thread admittedly, dropped out for a while there. Enjoy the ride, hope you will be able to ride it more and the weather improves.
@grantoury
Here's the links. The first one is great, but it only worked in Internet Explorer last time I checked, and right now it's not even working in my IE.
bicycles.stackexchange.com
Btw here's a picture of the original Mafacs - you can see that they were installed with the arm at > 90 degrees angle. Fair enough, mine is a bit more extreme at the moment (the froggo's geometry is not quite the same), but I'm sure I can dial in the correct mechanical advantage after a while.
Here's the links. The first one is great, but it only worked in Internet Explorer last time I checked, and right now it's not even working in my IE.
What is the mechanical advantage of mechanical rim brakes and levers?
I understand that the amount of hand force required for a given braking force depends on the mechanical advantage of the braking system, which in turn is a multiplication of the mechanical advantag...
bicycles.stackexchange.com
Btw here's a picture of the original Mafacs - you can see that they were installed with the arm at > 90 degrees angle. Fair enough, mine is a bit more extreme at the moment
(the froggo's geometry is not quite the same), but I'm sure I can dial in the correct mechanical advantage after a while.
Ah nice to see you again @M_Chavez - "zat craszzzeeey Englishman wizz zat crazzzeeeey French old velo projectte"
You are brave man diving into the maths about cantilever brakes. I'm not familiar with those froggleg brakes and I'm more in the camp of conventional wisdom. Anyhow, you won't be the first or last to mess around and swear at cantis around these parts
A thread opened a while ago with some great input and tips which could help and give some inspiration with your pad setting to the rim:
https://www.retrobike.co.uk/threads/canti-pad-set-up-what-tricks-do-you-use.461142/
My first reaction looking at your brakes is the mounting stud seems extended well out and you could get some brake chatter; moving it closer in the arms like the original Mafac I think would be beneficial.
Anyhow, good luck with your first 2023 ride on it and blowing the winter cobwebs away!
You are brave man diving into the maths about cantilever brakes. I'm not familiar with those froggleg brakes and I'm more in the camp of conventional wisdom. Anyhow, you won't be the first or last to mess around and swear at cantis around these parts
A thread opened a while ago with some great input and tips which could help and give some inspiration with your pad setting to the rim:
https://www.retrobike.co.uk/threads/canti-pad-set-up-what-tricks-do-you-use.461142/
My first reaction looking at your brakes is the mounting stud seems extended well out and you could get some brake chatter; moving it closer in the arms like the original Mafac I think would be beneficial.
Anyhow, good luck with your first 2023 ride on it and blowing the winter cobwebs away!
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Pleased to say that Frannie had her successful maiden voyage (can I even use the word "maiden" when talking about a 70 year old French girl that's been around quite a few blocks in her lifetime?
).
I was surprised that no parts fell off (none of them were really meant to fit together). The square taper cartridge did not unscrew itself, the threadless headset did not self-disintegrate, the manually filed & bolted rear hanger works well enough without any set-up at all, but I'm limited to 8 gears out of 9 at the moment (I need to work on the spacing & do the most basic set-up). The carbon fibre mech cage (again, manually filed and bolted to fit onto the old Dura-ace mech) did not snap off.
Even the brakes stopped me when I wanted to stop, albeit the froggos will be the first thing to come off the bike. I think if it started raining, my braking would have degraded to the point when I'd be chewing my saddle-tanned Lepper with my arse. I have a set of narrow, modern-style tektro jobbies that might just fit and provide the required increased mechanical advantage.
The bike does not track perfectly, which is expected, given that I had to cold set front & rear drops to fit modern hubs into them. This will need a tweak or two, but in all honesty, it is well rideable as is.
The 70 year old Acier du Fromage frame stayed in one piece, even after some [very] mild offroading. I did have to stop a few times and check that the stays did not break off, as the amount of flex in this frame is astonishing. Nope, all still brazed on. Riding on gravel is smooth as butter and effortless, so I am very pleased with that.
The seating position is that of an audax bike (just as I wanted) and will need some minor tweaking. I only had a spare 44cm bar, and I use a 40 on my road bike and 38 on my commuter, so prefer them quite narrow.
Well worth the time & effort it took to put this bike together.
).I was surprised that no parts fell off (none of them were really meant to fit together
). The square taper cartridge did not unscrew itself, the threadless headset did not self-disintegrate, the manually filed & bolted rear hanger works well enough without any set-up at all, but I'm limited to 8 gears out of 9 at the moment (I need to work on the spacing & do the most basic set-up). The carbon fibre mech cage (again, manually filed and bolted to fit onto the old Dura-ace mech) did not snap off.Even the brakes stopped me when I wanted to stop, albeit the froggos will be the first thing to come off the bike. I think if it started raining, my braking would have degraded to the point when I'd be chewing my saddle-tanned Lepper with my arse. I have a set of narrow, modern-style tektro jobbies that might just fit and provide the required increased mechanical advantage.
The bike does not track perfectly, which is expected, given that I had to cold set front & rear drops to fit modern hubs into them. This will need a tweak or two, but in all honesty, it is well rideable as is.
The 70 year old Acier du Fromage frame stayed in one piece, even after some [very] mild offroading. I did have to stop a few times and check that the stays did not break off, as the amount of flex in this frame is astonishing. Nope, all still brazed on. Riding on gravel is smooth as butter and effortless, so I am very pleased with that.
The seating position is that of an audax bike (just as I wanted) and will need some minor tweaking. I only had a spare 44cm bar, and I use a 40 on my road bike and 38 on my commuter, so prefer them quite narrow.
Well worth the time & effort it took to put this bike together.
