Extra isolastic

The extra isolastic below the gearbox is one of the signatures of the Dreer Commandos so I was rather interested to see that in the one recently sold on ebay that Kenny Dreer appears to have retained this but completely removed the headsteady and so going back to having three mounting points. I have one of the early Dreers which has a headmount and have always had some problems with straight line stability. As soon as I get it back on the road I will have to try it without the headsteady to see how it handles. Doing a bit of non-scientific lateral thinking a three legged table is more stable on any surface than a four legged table so applying the same kind of warped thinking three rubber mounts must be better than four?

I will be interested to hear how you get on.
If you do not follow-up on this one, I will assume the worst and not attempt to replicate your experiment.
Ta.

edward said:

a three legged table is more stable on any surface than a four legged table so applying the same kind of warped thinking three rubber mounts must be better than four?

Click to expand...

It may not be quite the same thing, but 3 wheeled vehicles, effectively with rubber doughnuts, have had rather a chequered history,
where 4 have been quite successful...

There seem to have a lot of variants on this isolastic theme, so the final word probably hasn't been penned.
As needing says, we look forward to a progress report sometime.

Fitted an extra mount to my 850 Commando special when i built it in 94 , also used a Norvil headsteady , handles really well .



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Triangulated isolastics are a great idea, especially if all three are backed up with rose/heim jointed links that only allow fore/aft movement. Kenny just figured he'd do a more robust lower one, instead of the relatively small upper one. Personally, I'd leave the upper one.

Not at all the same concept as a three-legged stool where completely different physics are involved.

I just got off the phone to the current owner of the first Dreer Commando, the one which actually featured in the Cycle World article and he told me that his does not have a headsteady either, Kenny Dreer only fitted the headsteady to the other variants (like mine) and not the alloy tanked bikes.

i have an extra isolastic mount under my gearbox it contains no rubbers i just use it to tighten up the back end ,i made it adjustable like a mk3 iso probably has 2 or 3 thou clearance at a guess i never measure it but i can run the bike without a head steady it makes no difference to the handling that i can notice cheers baz

might there be some pix pls?

Do a search on isolastics and you will see a thread with good discussion and many photos of several variants of the haunch / rump / bottom (third) isolastic.

Some are simple, some are very ingenious.