Originally Posted by
Canker
https://absoluteblack.cc/oval-road-c...-for-110-4bcd/
You can get a 30 on a 110BCD shimano crank but it isn't cheap
I know people have gotten away with running a 11-36 cassette with the Shimano Ultegra RX rd-rx800, the new one with a clutch, but even that one I think you would be pushing it to try a 11-40. If you don't want to run a road link and want a 11-40 cassette then you can switch to a shimano mtn RD and run a wolftooth tanpan
https://www.wolftoothcomponents.com/products/tanpan
Personally I'd just get one of the chinese $3 road links off ebay and try that first with your current RD and if it works great, if not you are out $3.
Sorry for the hijack, but I was about to ask the same question for my DB Haanjo Trail except I want to keep the double chainring and get an 11-40 or 11-42 cassette. Any suggestions for which cassette will replace the stock Shimano 105 CS-5800 cogset? To do this upgrade, I'd need the following (and tools, of course)?
--RoadLink
--longer chain
--11-40/11-42 cassette
Is that it?
Thanks,
Paul