POLSO INTRO7

POLSO is a bicycle parts maker in Suzhou, China. Its website is polsobike.com, and its fixed-gear products go by the name INTRO7. Frames, cranks, hubs, wheels — the whole bike can come from one name.

What follows is only what the official product list and retailer spec sheets say. Nothing about how it rides. We have not ridden one.

One line, from frames to small parts

The official product list carries INTRO7 fixed-gear frames (700C, steel, CR-MO), integrated cranks in 165 and 170 mm, track hubs (24H / 32H), 700C track wheelsets, and an aluminium headset. Everything a build needs, under one name.

The operating company is listed as Suzhou Jingqiyao, established 2019, Suzhou. It is a B2B inquiry-style site, so there are no prices on the product list.

The 48T crank ships with a bottom bracket

The retailer spec sheet for the INTRO7 48T crank lists 144 BCD, AL-7075-T6, 165 mm arms, and an included bottom bracket. A 144 crank takes 144 rings only — check first.

144 has a high floor on tooth count. Read 144 vs 130 BCD before choosing. If bottom brackets confuse you, start with the shell standards.

What is not confirmed

A roundup article describes an FM007 CR-MO frame in 52 / 55 cm with internal routing and an integrated brake hanger. That is the roundup's claim, not the official catalog's — the official list does not go that far. Ask the retailer to confirm against the real thing.

Before buying any Chinese frame, see the pre-purchase checklist (Japanese).

What the catalog does not publish, in one place:

• Geometry — no size charts anywhere
• Rear spacing, BB — no published frame-side values
• Japanese retail — no official dealer found as of now
• The real thing — we have not touched one

Prices change, so none are listed here. Check the official site and retailers.