Review: SEMI – RESISTIVE from 2009bikeman on ebay and etsy



  • hand sewn 8” trace has a resistance of 41 ohms
  • machine sewn top thread 8” trace has a resistance of 108 ohms
  • machine sewn bottom thread 8” trace has a resistance of 55 ohms


  • easy to thread a size 24 crewel needle
  • minimal fray or whisker
  • easy to sew by hand as well as machine
  • thread is wound on flat cardboard and has to be rewound on a bobbin for machine sewing

2009Bikeman thread is conductive, medium diameter, and has minimal fray. This thread is RECOMMENDED FOR CLASSES AND SHORT CIRCUITS ONLY. for both hand sewing and machine sewing eTextiles, soft circuit, craft-tech, or wearable computing.

To repeat – this thread is good enough for teaching a novice class, but the resistance is too high for making robust and extensive circuits.

2009bikeman ebay
Information from website:
6-Ply thread ~ 3 conductive fiber and 3 non-conductive polyester fiber.
Mathew Richie on ebay and etsy

Hand sewn LED circuit on cotton broad cloth with felt backing.
Positive and negative traces are 8 inches long.
bikeman2009 semi - resistive Conductive Thread Comparisons

Threads a crewel needle size 24 easily.
Jonh James Chenille Hand Sewing Needle Size 24

Hand sews a basic running stitch with minimal tangles or difficulties.
Conductive Thread Comparisons

1.8mm blue LED with 4 tight loops around the LED leads.
2009bikeman semi-resistive Conductive Thread Comparisons

Use a 3V CR2032 battery to power the circuit.
LED glows = empirical evidence that the thread is conductive
2009bikeman semi-resistive Conductive Thread Comparisons

on ebay
2009bikeman semi-resistive Conductive Thread Comparisons

The biggest fault with with this thread is that it is resistive making it difficult to create long traces and robust circuits.

Machine Stitching with a Schmetz Embroidery Needle 90/14
Schmetez Embroidery Needle for Berninia Home Sewing Machine

Machine stitching sample
top trace is bikeman’s thread as the top thread
bottom trace is bikeman’s thread as bobbin thread
Both methods sew smoothly with minimal snags or fraying.
2009bikeman semi-resistive conductive thread sewn with home sewing machine

The reverse side of the machine sewing sample
Conductive Thread Comparisons