DISRAELI GEARS

Excel Dynamic

Excel Dynamic derailleur main image

There must have been something in the water in the late 1970’s. Both Sachs (with their Super Sport) and Excel (with this - the Excel Dynamic) decided that this was the perfect moment to copy a 1958 design - the long obsolete Huret Allvit.

Unlike Sachs, Excel did not try to ‘improve’ every aspect of the Allvit, but instead faithfully copied it and then, at the last moment, added a spring loaded ‘cable saver’ to the cable clamp bolt mounting. The hanger proudly proclaims that this ‘cable saver’ design is covered by US patent # 3,903,751, first filed in April 1974 - which is a little interesting as Shimano had been using this design on their Lark since the late 1960’s.

The plastic tube covering the dangerously protruding ends of the springs is a classy detail, and as a final touch, Excel chose to rivet the tension pulley into place - it is not replaceable. The bitter taste of poor quality lingers long after the sweet flavour of a cheap price is forgotten - at least that’s what it says on my local plumber’s van - and he should know, because I can assure you that he forgot about a cheap price some considerable time ago.

In my collection of US derailleurs, resplendent with CNC jewellery and SRAM’s carbon composite masterpieces, the Excel Dynamic shares a proud position with the Elgin American as one of the two earliest US derailleurs that I own.

It serves as a warning to us all.


  • Derailleur brands: Excel
  • Country: USA
  • Date of introduction: 1975?
  • Date of this example: unknown
  • Model no.: unknown
  • Weight: 300g including hanger plate
  • Maximum cog: 30 teeth?
  • Total capacity: 32 teeth?
  • Pulley centre to centre: 54mm
  • Index compatibility: friction
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: two pivots, front sprung and rear unsprung
  • Materials: steel
Excel Dynamic derailleur additional image 01

Browse associated documents.



US Patent # 3,903,751

US Patent # 3,903,751

US Patent 3,903,751 - Excel Dynamic thumbnail
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