Every bike in the shop, from booked to picked up.

Fits, services, quotes, invoices and parts in one system: with the cost of every line beside the price, so you know the margin before the job leaves.

See a walkthrough Read what it does Build something like this

02 · Spec

What ships, and what we publish about it.

Tenacious Systems specifications
Platform	Web · Progressive Web App
Version	2.3.0as of Aug 2026
Status	Live
Audience	Independent bike shopsBike fitters · Mobile bike mechanics · Service departments in bike retail
Stack	Next.js 16 · React 19 · TypeScript · SupabasePostgreSQL · Tailwind CSS v4 · Vercel
Replaced	Setmore, Xero, spreadsheets, paperTenacious Systems manifest · as of Jul 2026
Fit record	14+ measurement pointsTenacious Systems manifest · as of Jul 2026
Service workflow	6 stagesTenacious Systems manifest · as of Jul 2026

03 · About

What it is.

A bike-fitting and bike-service shop management system that keeps customers, bikes, fits, jobs, quotes, invoices and parts in one place: with cost and price on every line so profit is visible per job.

The Tenacious System runs a bike shop that does both fitting and mechanical service. A bike is checked in, scoped at the bench, quoted for the customer's approval, worked, billed and picked up: and every step stays attached to the bike rather than to a piece of paper. Each quote and invoice line carries what the shop paid as well as what the customer pays, so margin is visible while the job is being built rather than at year end. Cost and profit are internal only and never appear on the customer's copy. It is in daily production use at a single shop, on real customer and money data, and is built mobile-first for a mechanic holding a phone or an iPad at the stand, and ships with light and dark themes.

04 · Figures

Real frames from the build.

Screenshots from the live site. No browser mockups: the product as deployed.

fig. 01The day at a glance: what is in the shop, what is due, and what is waiting on the customer.Tenacious Systems · mobile · v2.3.0 · Aug 2026

fig. 02Every bike in the shop on one board, grouped by the stage it is actually at.Tenacious Systems · mobile · v2.3.0 · Aug 2026

fig. 03A job in progress with Future Notes warned at the top: work flagged on a previous visit.Tenacious Systems · mobile · v2.3.0 · Aug 2026

fig. 04Check a whole household in at once: each bike becomes its own job on the board.Tenacious Systems · mobile · v2.3.0 · Aug 2026

fig. 05One customer, every bike, and the full service history behind them.Tenacious Systems · mobile · v2.3.0 · Aug 2026

fig. 06Future Notes on the bike Overview: durable notes, optional reminder, mark done or dismiss.Tenacious Systems · mobile · v2.3.0 · Aug 2026

fig. 10Building the work list at the bench, before anything is quoted.Tenacious Systems · desktop · v2.3.0 · Aug 2026

fig. 14A quote the customer can approve, with cost and price tracked on every line.Tenacious Systems · desktop · v2.3.0 · Aug 2026

fig. 15Invoices, what has been paid, and what is still outstanding.Tenacious Systems · desktop · v2.3.0 · Aug 2026

fig. 16A full fit session recorded against the bike, ready to compare next season.Tenacious Systems · desktop · v2.3.0 · Aug 2026

fig. 17Every fit on file, so a returning rider starts from last time's numbers.Tenacious Systems · desktop · v2.3.0 · Aug 2026

fig. 18Parts and labour catalogue: cost and price on every item.Tenacious Systems · desktop · v2.3.0 · Aug 2026

fig. 19The week ahead, so the bench is never over-booked.Tenacious Systems · desktop · v2.3.0 · Aug 2026

fig. 20Revenue against cost: what the shop actually made, not just what it billed.Tenacious Systems · desktop · v2.3.0 · Aug 2026

fig. 21Everything waiting to be ordered, grouped by vendor.Tenacious Systems · desktop · v2.3.0 · Aug 2026

05 · Features

Feature index.

Mechanics that are in the current build. Planned work stays out of this table until it ships.

Service workflow
Every bike in the shop moves through one explicit set of stages, from booked to picked up.
active
Quotes and customer approval
Build a quote from the work list and send the customer a link to approve it.
active
Cost and profit per job
Every line carries what the shop paid as well as what the customer pays.
active
Invoicing and payments
Convert an approved quote into an invoice and record how it was paid.
active
Bike-centred records
The bike is the record: fits, services, parts and ownership all hang off it.
active
Future Notes
Durable bike-pinned notes for near-future work, with a next-visit warning banner and an optional scheduled customer reminder email.
active
Bike fitting
Record a full fit against the bike and compare it against the last one.
active
Multi-bike check-in
Check a whole household in at once; each bike becomes its own job.
active
Customer records
One customer, every bike, and the history behind them.
active
Catalogue and parts ordering
A parts and labour catalogue with stock levels, and a list of what needs ordering.
active
Scheduling
Appointments on a calendar so the bench is not over-booked.
active
Finance view
Revenue against cost for the period, not just what was billed.
active
Dashboard
What is in the shop, what is owed, and what is booked: on one screen.
active

Tenacious Systems features
Feature	Summary	Status
Service workflow	Every bike in the shop moves through one explicit set of stages, from booked to picked up.	active
Quotes and customer approval	Build a quote from the work list and send the customer a link to approve it.	active
Cost and profit per job	Every line carries what the shop paid as well as what the customer pays.	active
Invoicing and payments	Convert an approved quote into an invoice and record how it was paid.	active
Bike-centred records	The bike is the record: fits, services, parts and ownership all hang off it.	active
Future Notes	Durable bike-pinned notes for near-future work, with a next-visit warning banner and an optional scheduled customer reminder email.	active
Bike fitting	Record a full fit against the bike and compare it against the last one.	active
Multi-bike check-in	Check a whole household in at once; each bike becomes its own job.	active
Customer records	One customer, every bike, and the history behind them.	active
Catalogue and parts ordering	A parts and labour catalogue with stock levels, and a list of what needs ordering.	active
Scheduling	Appointments on a calendar so the bench is not over-booked.	active
Finance view	Revenue against cost for the period, not just what was billed.	active
Dashboard	What is in the shop, what is owed, and what is booked: on one screen.	active

06 · Updates

Public update log.

Tenacious Systems updates
Aug 2026	Future Notes: durable bike notes, next-visit banner and optional reminder emailNear-future work pins to the bike and survives across visits. Active notes raise a warning banner at check-in and in service. Optional customer reminder emails use 1/2/3/6 month presets and send in a morning batch once Resend is connected. Product version remains 2.3.0.
Jul 2026	Supplementary billing, approval history and a clearer build listWork added to a job after the customer has approved it is now tracked and billed properly, approvals are recorded as an auditable history, and removed lines can be undone from the build list.

What ships, and what we publish about it.

Tenacious Systems specifications
Platform	Web · Progressive Web App
Version	2.3.0as of Aug 2026
Status	Live
Audience	Independent bike shopsBike fitters · Mobile bike mechanics · Service departments in bike retail
Stack	Next.js 16 · React 19 · TypeScript · SupabasePostgreSQL · Tailwind CSS v4 · Vercel
Replaced	Setmore, Xero, spreadsheets, paperTenacious Systems manifest · as of Jul 2026
Fit record	14+ measurement pointsTenacious Systems manifest · as of Jul 2026
Service workflow	6 stagesTenacious Systems manifest · as of Jul 2026

What it is.

Feature index.

Mechanics that are in the current build. Planned work stays out of this table until it ships.

Service workflow
Every bike in the shop moves through one explicit set of stages, from booked to picked up.
active
Quotes and customer approval
Build a quote from the work list and send the customer a link to approve it.
active
Cost and profit per job
Every line carries what the shop paid as well as what the customer pays.
active
Invoicing and payments
Convert an approved quote into an invoice and record how it was paid.
active
Bike-centred records
The bike is the record: fits, services, parts and ownership all hang off it.
active
Future Notes
Durable bike-pinned notes for near-future work, with a next-visit warning banner and an optional scheduled customer reminder email.
active
Bike fitting
Record a full fit against the bike and compare it against the last one.
active
Multi-bike check-in
Check a whole household in at once; each bike becomes its own job.
active
Customer records
One customer, every bike, and the history behind them.
active
Catalogue and parts ordering
A parts and labour catalogue with stock levels, and a list of what needs ordering.
active
Scheduling
Appointments on a calendar so the bench is not over-booked.
active
Finance view
Revenue against cost for the period, not just what was billed.
active
Dashboard
What is in the shop, what is owed, and what is booked: on one screen.
active

Tenacious Systems features
Feature	Summary	Status
Service workflow	Every bike in the shop moves through one explicit set of stages, from booked to picked up.	active
Quotes and customer approval	Build a quote from the work list and send the customer a link to approve it.	active
Cost and profit per job	Every line carries what the shop paid as well as what the customer pays.	active
Invoicing and payments	Convert an approved quote into an invoice and record how it was paid.	active
Bike-centred records	The bike is the record: fits, services, parts and ownership all hang off it.	active
Future Notes	Durable bike-pinned notes for near-future work, with a next-visit warning banner and an optional scheduled customer reminder email.	active
Bike fitting	Record a full fit against the bike and compare it against the last one.	active
Multi-bike check-in	Check a whole household in at once; each bike becomes its own job.	active
Customer records	One customer, every bike, and the history behind them.	active
Catalogue and parts ordering	A parts and labour catalogue with stock levels, and a list of what needs ordering.	active
Scheduling	Appointments on a calendar so the bench is not over-booked.	active
Finance view	Revenue against cost for the period, not just what was billed.	active
Dashboard	What is in the shop, what is owed, and what is booked: on one screen.	active

Public update log.

Tenacious Systems updates
Aug 2026	Future Notes: durable bike notes, next-visit banner and optional reminder emailNear-future work pins to the bike and survives across visits. Active notes raise a warning banner at check-in and in service. Optional customer reminder emails use 1/2/3/6 month presets and send in a morning batch once Resend is connected. Product version remains 2.3.0.
Jul 2026	Supplementary billing, approval history and a clearer build listWork added to a job after the customer has approved it is now tracked and billed properly, approvals are recorded as an auditable history, and removed lines can be undone from the build list.