Bicycles Asked on July 6, 2021
I plan to use my new Canyon Endurace AL (11-34, 52/36) for some touring and I’d like some slightly more pleasant gears as I’ll be carrying some weight (I have a tailfin rack I’m using with it) up some hills.
My ideal setup would be buying a 46/30 crankset for around £100-£150 which I could just swap in when touring (a couple weeks a year) (readjusting the front derailleur of course) and swap out when doing normal riding (95% of the year). I realise I’d also probably need to swap over the chain or shorten it each time.
Are there any such 46/30 or 48/31 cranksets that would work with a 105 setup and standard Shimano BB? I wouldn’t want to change the BB over each time. I saw the RX600 but assume this would need a new FD as well due to the chainline difference. Are there any hacks to make it work? Are there any parts in Shimano’s lineup that could help – I don’t mind if it’s not perfectly permitted by Shimano, just need it for a couple weeks a year really.
If not, I guess my options are just to switching the chainrings down to 50/34 – a small decrease of about 6% vs 17% for 46/30 but better than nothing. Would that be just a case of buying two new chainrings and installing them?
I assume your current crankset has a 110mm BCD? You could go down to 46/33 teeth. (example 33 teeth chainring: https://www.bike-components.de/en/TA/X110-Chainring-4-arm-Inner-110-mm-BCD-p46803/)
The Shimano RX600 crankset puts the rings and pedals slightly more outwards. It might work with a normal road front derailleur, otherwise (officially) you need a GRX front derailleur.
I’d rather go for a traditional width, something like the FSA Supercompact with 46/30t.
Correct answer by Michael on July 6, 2021
A 46-teeth ring is also available as a big ring for cyclocross. It is usually combined to a 36 but it works with a 34 as well, though Shimano doesn't endorse the combination. That way you'll just have to get the chainrings (and second chain) The 46 ring is a simple inexpensive flat ring with 4 plastic bolt covers on the spider.
The problem with going smaller may reside in the possible lack of clearance between rings and chainstay.
Answered by Carel on July 6, 2021
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