I am preparing for a new road disc frame and - of course- want to use what I still have on stock. So I found some Syntace Dropouts and straight Columbus Life short taper chainstays. For using those I’d need to attach the Flatmount Attachements to the Chainstay. However, I don’t like the optics of those rather bulky round bosses and I also dislike the thought of removing almost all of the chainstay to make the outer boss fit.
So I just thought of using the front flatmount adapters for the forks and just adding two tabs with M5 thread to the chainstay.
Does that work? Any downside I oversee other than I have to use one of the adapters?
Also would appreciate some pics if anybody ever did so. Couldn’t find much in the web.
Yep, have done this to about 10 frames now and works well. No real tricks to it other than sticking to the interface standards that Shimano/Sram publish.
I’ve seen a few builders do that, and I’ve heard it being called the “Zullo Mount.” I guess that’s because one of the first builders to do it was Tiziano Zullo? Here are the ones I remember off the top of my head:
Zullo (obviously)
Legor
Rizzo
RS Cycles
Pegoretti
Have a look there and you will find some nice examples.
I had a go at this a while ago as I also thought it made sense. only photo I have on hand is a bit weird, but you get the picture. I notched for one, and drilled through for one, and soldered in threaded plugs, bike had seen ~5000km under me (90kg, big-gear grinder, sprinty, rough roads) no troubles so far, though I don’t like how much material was removed from the stay, so while it has been fine, I probably wouldnt do it this way again.
Thanks a lot. Checked the Pegoretti website and I think it looks pretty much how I thought. As a side note its also far easier to manufactur these bosses by myself on the lathe rather then the standard ones with the slotted holes.
If you’re hoping to use the Columbus Life short taper chainstays, it’s probably worth modeling the assembly in CAD or doing a quick mock-up to verify that the caliper mounts can be positioned at the correct height relative to the axle – I think the forward boss will be close to the 30mm portion of the tube, and based on SRAM’s spec, that’s a no-go for a 140/160 rotor configuration and an extremely tight fit for 160/180 rotors. You might be able to offset the axle from the tube centerline to gain some wiggle room for the 160/180 configuration, but it’ll likely be a game of millimeters to get the short taper tube to work.
It certainly works well. This is a Columbus XCR application. Basically a stainless bottle boss, drilled nearly dead center for the front most mount. Then a lathe turned mount notched for the rear.
