# Axlow V1 Preliminary BOM

Date: 2026-06-08

Status: Concept BOM for Prototype 0 costing and sourcing.

## 1. Fabricated Frame And Structure

| Item | Description | Qty | Source | Notes |
| --- | --- | ---: | --- | --- |
| F1 | Main spine tube, rectangular or round mild steel | 1 | In-house | Approx 1300-1500 mm final length after CAD |
| F2 | Front cross-member tube | 1 | In-house | Carries left/right steering assemblies |
| F3 | Rear fork/triangle tubes | 1 set | In-house | Supports rear driven wheel |
| F4 | Adjustable boom receiver tube | 1 | In-house | Welded into front of spine |
| F5 | Adjustable crank boom tube | 1 | In-house | Telescopes into receiver |
| F6 | Seat base support tubes | 1 set | In-house | Bolted or welded mounts |
| F7 | Seat back support tubes | 1 set | In-house | Prefer bolted angle adjustment |
| F8 | Front cross-member gussets | 2-4 | In-house | 3-5 mm MS plate |
| F9 | Seat mount brackets | 4-6 | In-house | Slotted/alternate holes for adjustment |
| F10 | Idler bracket | 1-2 | In-house | Machined/fabricated |
| F11 | Brake/cable tabs | As needed | In-house | Weld-on tabs |
| F12 | Flag/light/reflector mounts | As needed | In-house | Safety visibility |

## 2. Steering

| Item | Description | Qty | Source | Notes |
| --- | --- | ---: | --- | --- |
| S1 | Left steering knuckle/upright | 1 | In-house or bought-out | High-risk design item |
| S2 | Right steering knuckle/upright | 1 | In-house or bought-out | Mirror of S1 |
| S3 | Kingpin shafts/bolts | 2 | In-house/bought-out | Must be robust and serviceable |
| S4 | Steering arms | 2 | In-house | Ackermann angle to be modeled |
| S5 | Tie rod | 1 | Bought-out/in-house | Threaded adjustment |
| S6 | Drag links/handle links | 2 | Bought-out/in-house | Depends on steering layout |
| S7 | Rod ends/heim joints | 4-8 | Bought-out | Prefer standard available parts |
| S8 | Side steering handles | 2 | In-house | Tube with bicycle grips |
| S9 | Mechanical steering stops | 2 | In-house | Prevent interference |

## 3. Wheels, Tyres, And Brakes

| Item | Description | Qty | Source | Notes |
| --- | --- | ---: | --- | --- |
| W1 | 20 inch front wheel with disc hub | 2 | Bought-out | Left/right front |
| W2 | 26 inch rear wheel with cassette/freewheel hub | 1 | Bought-out | 20 inch alternate |
| W3 | Tyres, 20 inch | 2 | Bought-out | 1.5-2.0 inch width |
| W4 | Tyre, 26 inch | 1 | Bought-out | Match intended surface |
| W5 | Tubes | 3 | Bought-out | Add spares for test |
| B1 | Front disc brake calipers | 2 | Bought-out | Mechanical preferred for V0 |
| B2 | Front brake rotors | 2 | Bought-out | Match hubs/calipers |
| B3 | Brake levers | 2 | Bought-out | Linked lever can be evaluated later |
| B4 | Brake cables/housing | 1 set | Bought-out | Route clear of steering movement |
| B5 | Rear parking brake | 1 | Optional | Useful for senior/campus variant |

## 4. Drivetrain

| Item | Description | Qty | Source | Notes |
| --- | --- | ---: | --- | --- |
| D1 | Crankset | 1 | Bought-out | 1x or 3x |
| D2 | Bottom bracket | 1 | Bought-out | Mount in adjustable boom shell |
| D3 | Pedals | 1 pair | Bought-out | Standard bicycle |
| D4 | Chain | 2-3 lengths | Bought-out | Long recumbent chain |
| D5 | Rear derailleur | 1 | Bought-out | For 1x8/1x9/3x7 |
| D6 | Shifter | 1 | Bought-out | Handle placement to be decided |
| D7 | Cassette/freewheel | 1 | Bought-out | Wide range preferred |
| D8 | Idler pulley, power side | 1 | Bought-out/in-house | Smooth, low-noise, robust |
| D9 | Return idler or guide | 1 | Optional | Depends on chain path |
| D10 | Chain tubes/guards | 1 set | Bought-out/in-house | Protect rider and clothing |
| D11 | Chain tension management | 1 set | Built into derailleur | Review if long chain sags |

## 5. Seat And Rider Contact

| Item | Description | Qty | Source | Notes |
| --- | --- | ---: | --- | --- |
| R1 | Seat frame tubes | 1 set | In-house | Removable module |
| R2 | Mesh seat material | 1 | Bought-out | Breathable preferred |
| R3 | Seat padding/edge trim | 1 set | Bought-out | Comfort and finish |
| R4 | Seat mounting bolts | 1 set | Bought-out | Use locking nuts/washers |
| R5 | Grips | 2 | Bought-out | Standard bicycle grips |
| R6 | Optional headrest | 1 | Future | Not needed for V0 |

## 6. Fasteners, Bearings, And Finish

| Item | Description | Qty | Source | Notes |
| --- | --- | ---: | --- | --- |
| H1 | General fasteners | 1 lot | Bought-out | Grade to be specified |
| H2 | Washers/spacers/bushes | 1 lot | In-house/bought-out | Avoid slop in steering |
| H3 | Lock nuts/threadlocker | 1 lot | Bought-out | Vibration resistance |
| H4 | Paint or powder coating | 1 lot | Local vendor/in-house | V0 can be simple paint |
| H5 | Reflectors/lights/flag | 1 set | Bought-out | Strongly recommended |

## 7. Costing Buckets

Use these buckets for early cost estimation:

- Frame fabrication material
- Cutting/bending/welding labor
- Jigs and fixtures
- Steering custom parts
- Bought-out wheels/tyres
- Bought-out drivetrain
- Bought-out brakes
- Seat material and fabrication
- Paint/coating
- Assembly labor
- Testing/rework allowance

## 8. Prototype 0 Sourcing Philosophy

Buy proven bicycle parts first. Manufacture the parts that define Axlow:

- Frame
- Steering geometry
- Seat structure
- Boom adjustability
- Idler and chain management
- Custom brackets

Custom gears, internal hubs, belt drive, suspension, and folding should be later phases.