Shimano GRX Di2

[Bo6]

Getting ready to order a frame and build a V20, but before I do, have a couple of questions. I plan to use Shimano GRX Di2 group, which means there has to be a place to store the battery. It kind of looks like the boom may be a logical place, and I wonder if anyone has tried this or can think of reasons it would not work? Yes, I know a Scram totally wireless would be easier, but Rotor doesn't make suitable AXS chain rings, and I like their 155 cranks and direct mount Q rings.

The plan is to use Rotor 48/32 oval chainrings with a Scram 11-36 cassette to get a wide range of gears with a 5-6 rpm between gears. Wheels will be something like Elite Drive 50 or 65 with Continental 32 or 30mm GP5000 tires, but I am unsure how much wind will affect the deeper 65 wheel. Any thoughts?

Given that I ride a Q45 I thought the V20 would give me good range of cycling options (as Per Maria's recommendation) and it is in stock. The one issue may be that group rides through urban and hilly rural roads is my primary biking use the 20 deg angle may be a bit aggressive. I have seen a few options to get a 30+ seat angle and this is what I was planning to try. I wonder if anyone has tried this and their thoughts?

The various post in these forums have provided a tremendous amount of information on these bikes. Looking forward to any more ideas.

 

[cpml123]

I have a V20. I am not sure the front derailleur stalk can accommodate 48 teeth ring. You might need an adapter of some sort to make it work because the gap might be too big. I had 50/34, and it kept dropping the chain when shifting from 34 to 50. I ended up replacing it with a 52 ring. Problem solved. I am using a Sram Rival front derailleur.

 

[Damien]

I'll be watching closely to see how it goes for you. I'll soon start riding the S40 with Microshift components. Ultimately, I'm thinking about Shimano Di2 – since I already have it on my Specialized Roubaix and I'm in love with how it works. I'm also considering SRAM – but from experience, I know it's better to have everything in one standard so I can swap wheels if needed or borrow a cassette from another bike.

I have a mix of GRX and 105 components in mind. From the GRX lineup, the crankset 46/30 or 48-31 (I haven’t decided yet) would suit me, and for those cranks, a GRX front derailleur is required. For the rest, I'd choose Shimano 105, along with the 11-36 cassette that I already have on my wheels. Unfortunately, Shimano doesn’t offer short cranks, so I might go with that corder , or maybe a Rotor crankset (though those are quite expensive, and I’m not sure they’re worth it for my amateur riding). There aren’t many options to mix and match, as Shimano Di2 doesn’t have much flexibility for component combinations.