Shimano Ultegra FC-R8100 Crankset Crankset
What the checker says99will not fit8check before you buy21worth knowing
Run variant by variant through the road bike builder’s own engine. Every sentence below is the checker’s, unedited. Nothing here says this part fits your bike; it says what it does and does not fit among the parts we hold.
Checked against 1006 verified road bike parts in this catalog. 914 produced no finding of any kind; that is Ultegra FC-R8100 Crankset (46/36). Ultegra FC-R8100 Crankset clears 910. Each variant produces 33 distinct errors and 0 to 4 distinct warnings.
Will not fit
Rg bb spindle, Bottom Bracket. 87 more findings from the same check, on up to 1 of the 44 verified bottom brackets each.
Rg 2x control, Shifter/Brake Levers. 12 more findings from the same check, on up to 1 of the 25 verified shifter/brake levers each.
Open a variant in the builder to see the ones that apply to your own parts.
Check before you buy
- Check before you buywarning · Front DerailleurFront derailleur capacity: Shimano Ultegra FC-R8100 Crankset (50/34)'s 50/34 rings are 16T apart, over the SRAM Force AXS Front Derailleur's 13T capacity. On 1 of the 22 verified front derailleurs in this catalog. Applies to 1 of 3 variants.
- Check before you buywarning · Front DerailleurFront derailleur capacity: Shimano Ultegra FC-R8100 Crankset (50/34)'s 50/34 rings are 16T apart, over the SRAM RED AXS Front Derailleur's 13T capacity. On 1 of the 22 verified front derailleurs in this catalog. Applies to 1 of 3 variants.
- Check before you buywarning · Front DerailleurFront derailleur capacity: Shimano Ultegra FC-R8100 Crankset (50/34)'s 50/34 rings are 16T apart, over the SRAM Rival AXS Front Derailleur D1 (Wide-Compatible)'s 13T capacity. On 1 of the 22 verified front derailleurs in this catalog. Applies to 1 of 3 variants.
- Check before you buywarning · Front DerailleurFront derailleur capacity: Shimano Ultegra FC-R8100 Crankset (50/34)'s 50/34 rings are 16T apart, over the SRAM Rival AXS Front Derailleur's 13T capacity. On 1 of the 22 verified front derailleurs in this catalog. Applies to 1 of 3 variants.
- Check before you buywarning · Front DerailleurFront derailleur capacity: Shimano Ultegra FC-R8100 Crankset's 52/36 rings are 16T apart, over the SRAM Force AXS Front Derailleur's 13T capacity. On 1 of the 22 verified front derailleurs in this catalog. Applies to 1 of 3 variants.
- Check before you buywarning · Front DerailleurFront derailleur capacity: Shimano Ultegra FC-R8100 Crankset's 52/36 rings are 16T apart, over the SRAM RED AXS Front Derailleur's 13T capacity. On 1 of the 22 verified front derailleurs in this catalog. Applies to 1 of 3 variants.
- Check before you buywarning · Front DerailleurFront derailleur capacity: Shimano Ultegra FC-R8100 Crankset's 52/36 rings are 16T apart, over the SRAM Rival AXS Front Derailleur D1 (Wide-Compatible)'s 13T capacity. On 1 of the 22 verified front derailleurs in this catalog. Applies to 1 of 3 variants.
- Check before you buywarning · Front DerailleurFront derailleur capacity: Shimano Ultegra FC-R8100 Crankset's 52/36 rings are 16T apart, over the SRAM Rival AXS Front Derailleur's 13T capacity. On 1 of the 22 verified front derailleurs in this catalog. Applies to 1 of 3 variants.
Worth knowing
- Worth knowinginfo · FrameBottom bracket: Shimano Ultegra FC-R8100 Crankset (46/36) has a 24mm-road spindle - pick the matching t47-road-shell / 24mm-road bottom bracket for this frame (sold separately). On 18 of the 59 verified frames in this catalog. Applies to 1 of 3 variants.
- Worth knowinginfo · FrameBottom bracket: Shimano Ultegra FC-R8100 Crankset (50/34) has a 24mm-road spindle - pick the matching t47-road-shell / 24mm-road bottom bracket for this frame (sold separately). On 18 of the 59 verified frames in this catalog. Applies to 1 of 3 variants.
- Worth knowinginfo · FrameBottom bracket: Shimano Ultegra FC-R8100 Crankset has a 24mm-road spindle - pick the matching t47-road-shell / 24mm-road bottom bracket for this frame (sold separately). On 18 of the 59 verified frames in this catalog. Applies to 1 of 3 variants.
Rg bb advisory, Frame. 18 more findings from the same check, on up to 17 of the 59 verified frames each.
Open a variant in the builder to see the ones that apply to your own parts.
$280.00 MSRP·700 to 711 g
What the maker states
- Bottom bracket
- Bottom-bracket interface 24mm-road
- Chainline
- 44.5 mm
- Chainrings
- 2x chainrings
- Ring standard
- Chainring standard standard 12-speed
- Speeds
- 12-speed (rear index count the maker rates it for)
- Ring
- Chainrings 46/36 (on 1 of 3 variants); Chainrings 50/34 (on 1 of 3 variants); Chainrings 52/36 (on 1 of 3 variants)
A value shown as a set or a range differs between this model’s variants and is never one variant’s spec.
3 verified variants
| Variant | Ring | Price (MSRP) | Weight | Source | Last checked | Build |
|---|---|---|---|---|---|---|
| Ultegra FC-R8100 Crankset | Chainrings 52/36 | $280.00 | 711 g | maker’s page | 2026-07-20 | Build with this |
| Ultegra FC-R8100 Crankset (46/36) | Chainrings 46/36 | $280.00 | 702 g | maker’s page | 2026-08-15 | Build with this |
| Ultegra FC-R8100 Crankset (50/34) | Chainrings 50/34 | $280.00 | 700 g | maker’s page | 2026-08-15 | Build with this |
Source
Source: each variant links the maker’s own page in the table above. Last checked 2026-07-20 to 2026-08-15.
Checked against
The checker ran this model against every verified part below that it has a slot for, the same way it checks a build in the builder. What follows is the verdict it actually produced for that specific pairing — not a recommendation, and not a guarantee any of these parts fits your own bike.
- 3T Aeroflux Integrale (Handlebar) No conflicts found
- 3T Apto Stealth Stem (Stem) No conflicts found
- 3T Superergo LTD (standard, non-INTEGRALE) (Handlebar) No conflicts found
- All-City Zig Zag Frameset (Frame) Worth knowing
- Argon 18 SUM D-Shape Seatpost (Seatpost) No conflicts found
- Argon 18 Sum Frameset (Frame) Worth knowing
6 of 681 counterparts with a page of their own that the checker actually probed this model against, in alphabetical order by brand and model — never by price, popularity or the verdict itself.