State Bicycle Co. 4130 Road v2 Gearing: Identify the 42T and 11–28T Eight-Speed Record
State Bicycle Co. 4130 Road v2 gearing is identified by a 42T front ring and an 11–28T eight-speed cassette, together with named shifting components. Retain the model codes when checking a bicycle or making a parts enquiry. The published list records equipment; it does not inspect wear or approve a different combination.
Read the State Bicycle Co. 4130 Road v2 gearing as a set
The product record identifies a SunRace CSM86 cassette with an 11–28T range and eight speeds. The two endpoints describe tooth counts, whereas eight describes the number of rear positions. Keeping both fields avoids an ambiguous note such as “an eleven-speed rear,” which would misread the smallest sprocket as the speed count.
At the front, the record lists a forged 6061 aluminum 42T chainring with 110 BCD. The front tooth count is not the crank-arm length or the rear gear count. The PDF separately lists 170mm crank arms, so a dimensioned parts question should preserve those labels instead of combining all the numbers under “gearing.”
Retain the shifter and derailleur names
The State Bicycle Co. 4130 Road v2 Sensah Reflex entry describes integrated drop-bar shifters for 1x8. The product page names a SunRace RD-R81-SD rear derailleur. The PDF’s detailed entry instead says RD-R81, while its overview uses RDR81-SD. Quote the source wording that you used; the documents do not explain whether the shorter label is an abbreviation or a different item.
This is the concrete Road v2 listing behind the identification reference. Its model title helps distinguish the geared bicycle from State’s fixed-gear families. The catalogue listing is State Bicycle Co. 4130 Road v2 - Black & Tan - (8-Speed).
A component record is the start of an enquiry
The PDF names a KMC Z8 eight-speed chain. For a bicycle with uncertain replacement history, compare its actual component markings with this record before asking what has changed. A matching family name does not demonstrate adjustment, remaining service life or replacement compatibility. The pictured Contender owner build supplies historical brand context, not evidence of this eight-speed installation.
The existing State introduction provides wider context for its differently named families. State Bicycle Co. topic; existing State introduction.
FAQ
How many rear speeds are listed?
The cassette and shifting record specify eight speeds.
Is 42T the stated crank length?
No. It is the front chainring tooth count.
Do the source codes approve a cassette swap?
No. They identify recorded equipment without giving a substitution approval.
Sources
Manufacturer Road v2 product record (https://www.statebicycle.com/products/4130-road-v2-black-tan-8-speed). Manufacturer Road v2 specification PDF (https://cdn.shopify.com/s/files/1/0232/3305/files/2026-4130-Road-SizeSpec-FixedHeight.pdf?v=1791313727).
Photograph credits and permissions
Photograph 1
Original title: IMG_6798
Creator: pstmn; creator URI: https://www.flickr.com/photos/post_man
Copyright notice: Embedded EXIF and XMP retain the literal placeholders “Photographer:” and “Copyright:”; these are not names of different people. Embedded sRGB IEC61966-2.1 colour-profile notice: Copyright (c) 1998 Hewlett-Packard Company. This is the colour-profile owner, not the photographer.
Original source URI: https://www.flickr.com/photos/post_man/16587024389/
License / permission: CC BY 2.0
License / permission URI: https://creativecommons.org/licenses/by/2.0/
Modification notice: Original Flickr-downloaded JPEG bytes retained with no local crop, recompression or colour edits. EXIF and XMP retain Adobe Photoshop Lightroom 5.3 (Windows), a RAW-to-JPEG derived event, and the 19 January 2015 save event; earlier processing is unassessed.
Source disclaimer: Historical State Contender owner build as described by the source, with custom wheels and hubs; Walter is the owner, not the credited photographer. Related State Bicycle Co. context only, not a photograph of current Road v2 Black & Tan or proof of its colour, dimensions, parts, material, condition, fit or compatibility. Capture and upload dates do not establish bicycle model year. Exact licence: Creative Commons Attribution 2.0 Generic. No endorsement or warranties are implied; other rights may apply. The unchanged photograph remains under CC BY 2.0; no additional restrictions are imposed.