Avanti Giro ER-C Di2 vs Mechanical: Identify the Actual Shift System
Avanti Giro ER-C Di2 vs mechanical is a comparison between two complete builds with similar names and overlapping equipment. Start with the controls and derailleurs. The current mechanical model, reference 297719, lists ST-R7120 shifters and R7100 derailleurs. The Di2 model, reference 297718, lists ST-R7170 controls and R7150 derailleurs. Those identifiers are more useful than seeing “105” on a component.
Avanti Giro ER-C Di2 vs mechanical: use both manufacturers’ records
Avanti supplies the complete-bike specification. Shimano supplies the component description: its ST-R7120 page identifies a mechanical twelve-speed dual-control lever, while its RD-R7150 page identifies a Di2 rear derailleur. Reading those sources together connects the advertised bicycle to the type of shift system, without guessing from paint colour or a seller’s abbreviated title.
There is a reason to be specific. Avanti’s range-introduction summary describes the Di2 groupset with an R7120 label, whereas the individual Di2 product page lists ST-R7170 controls and R7150 derailleurs. Keep that source inconsistency visible. The sensible purchasing check is the delivered bicycle’s identifiers and the dealer’s model record, rather than silently changing a manufacturer’s wording to make the summaries agree.
Separate shifting from the rest of the specification
Electronic shifting does not make every other component electronic. The mechanical model’s manufacturer description includes hydraulic disc brakes. A reference to hydraulic braking therefore does not identify Di2. Likewise, the current two listings share 50/34 chainrings and an 11–34 twelve-speed cassette, so the Di2 label alone does not promise a different lowest gear.
Ask which difference matters for ownership. One buyer may want to understand the charging arrangements of the electronic build. Another may prefer to discuss maintenance of a mechanical shift system with the workshop. Those are useful questions about the complete bicycle. They are not evidence that either version has been tested here, shifts faster in a measured comparison or suits every rider better.
Make the inspection concrete
For a new complete bicycle
Have the seller confirm the model reference and fitted control and derailleur codes. Keep the final equipment description with the purchase record. Avanti explicitly reserves the right to change specifications, so an online list should be checked against the bicycle actually supplied.
For a used or modified bicycle
The original product name may no longer describe every fitted component. Request readable photographs of the identifiers, and ask which equipment has been replaced. Do not assume that adding Di2 controls alone creates an approved conversion. An assessment of the entire intended system is a separate task from identifying what is already present.
The older Cadent shown here is a clearly labelled historical road-brand illustration. Its controls, brakes and visible cables cannot verify the equipment of a current Giro ER-C. The product references and component records, followed by inspection of the actual bicycle, supply the useful evidence.
FAQ
Does Shimano 105 always mean Di2?
No. The cited mechanical build also uses Shimano 105 components.
Do hydraulic brakes identify electronic shifting?
No. The current mechanical Giro ER-C also lists hydraulic disc brakes.
Which record should resolve an ambiguous summary?
Use the specific complete-bike listing, the component-maker identification and the actual delivered equipment together.
The Avanti introduction places the Giro family in context. For narrower ownership topics, continue through the existing Avanti reference topic with the exact model and component identifiers in hand.
Primary references: Avanti manufacturer reference 1 (https://avantibikes.com/product/giro-er-c-297719/); Avanti manufacturer reference 2 (https://avantibikes.com/product/giro-er-c-di2-297718/); Avanti manufacturer reference 3 (https://avantibikes.com/introducing-the-giro-er-c-range/); Shimano manufacturer reference 4 (https://bike.shimano.com/en-NA/products/components/pdp.P-ST-R7120-L.html); Shimano manufacturer reference 5 (https://bike.shimano.com/products/components/pdp.P-RD-R7150.html).
Photograph credits and permissions
Photograph 1
Original title: New ride
Creator: Yun Huang Yong; creator URI: https://www.flickr.com/photos/goosmurf
Original source URI: https://www.flickr.com/photos/goosmurf/4845857240
License / permission: CC BY 2.0
License / permission URI: https://creativecommons.org/licenses/by/2.0/
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