robertj298 

I have a set of Dura Ace Dyna Drive pedals. The dust covers are impossible to find.
Do you think a piece of duct tape over the opening would work or would there be
another available option?

merziac

C'mon man, you know we have to have pics, especially when you ask about a wacky thing like these.

clubman 

Exactly. I have some 600 EX pedals that may have the same cover and I'll NEVER use these.

Duct tape? That should be in P&R or Sex Kink or somewhere else.

robertj298 

Herei thought everyone here was an expert on things vintage lol

noobinsf 

If it interests you, I know adapters exist to allow using normal pedals in a Dyna Drive crank, but I have no idea how rare, sought after, or expensive they are. I'd look at ebay.

merziac

Nope, AX Dyna Drive are the offset 1in axle mongol that put your foot below the one sided axle for some otherworld reason that didn't prove out sales wise.

noobinsf 

“Last one” for a pair of adapters from this seller in Poland, $30.

https://www.ebay.com/itm/New-cranks-...YAAOSwWeZfchWt

merziac

Vintage, yes, these wacky, obscure, short lived things, not so much.

Are you talking about the originally blue plastic caps that are never seen for having been lost long ago?

Is the allen hole open on the inside?

robertj298 

I've seen the adapters but would rather keep the bike as original as I can

merziac

You might be able to find some plastic caplugs like come on fittings to protect them during shipping and handling, efbay has has em, you may have to settle for red.

robertj298 

Thanks I'll look into it

clubman 

Sorry, typo. 600 AX. Too tired to get pic right now.

BTW, I've never heard a rave review of these groups from the forum. Anyone? Before I sell the whole group?

repechage

I have a set of Dura-Ace DynaDrive pedals... I have no idea when one is referring to dust covers. Nothing in back, and nothing in the pedal body hole that I have ever seen.
There were curious light blue plastic covers for the headset. They add something to the pedal?
We never saw the headset aero caps in real life either way back.
Maybe on the Adamus? lower tier model? Don't recall the exact spelling.

merziac

They were a kludge in the end, plenty of sellers on efbay think they are rare, cool, and worth $$$, seems to not be the case.

Merz was fond of the cranks I think because they were very nice finish wise, cheap and available when that stuff fell on its face.

He made triples out of them, also made his own adapters, I have two bikes with cranks and one with his adapters, huge plus for me.

repechage

the Dura-Ace AX cranks did have a narrow "Q" factor at the BB spindle. interestingly, kind of abandoned for the 7400 group that followed on.
The W cut teeth, designed to enhance shifting.
The freehub... kind of ahead of its time.
Problem was the units in operation of Campagnolo race wheels... with the Uniglide chain that stretched fast (I tested one for them, I cut the test short, three weeks instead of a month as it had stretched in about 1,000 miles)
If they had gone with a narrow chain, which did not really exist yet, they could have squeezed in 7 cogs... Now that would have gotten attention.

robertj298 

The covers are in the inside of the pedal shafts. When they are missing you can see the bearings inside

clubman 

I'll look tomorrow.

thumpism 

Try rubber O-rings. Go to a plumbing supply place and see what sizes are available. You might find something very close to the right size that will work and will likely be very cheap.

robertj298 

That'sa great idea. Thanks

RobbieTunes

I have a set NIBag somewhere.

squirtdad

you are by now the de facto expert on AX

JohnDThompson 

Which piece are you missing?

T-Mar

Dyna Drive pedals have two dust seals (see attached parts diagram).


Dyna Drive are my favourite toe clip and strap pedals. They were actually introduced for the 1980 model year on Dura-Ace EX and later incorporated into AX. The purpose was to put the shoe/pedal interface on the axle axis. This created a much more stable pedal platform. Shimano claimed that this stability allowed extra force be applied to the pedal that would otherwise be used to stabilize the foot. The 'extra power' claim always seemed a bit tenuous but the increased stability was readily noticeable. The concept actually goes back to the 1890s, having been resurrected periodically over the years.


On top that they had tons of cornering clearance compared to a traditional quill pedals of the era. Another big advantage is their ease of overhaul. Disassembly, assembly and adjustment requires only two 6mm Allen wrenches. Bearing adjustment is a breeze, as there's no fumbling with a cone buried under a locknut in tight confines. Personally, I also feel that they have the best aesthetics of all toe clip and strap pedals.

As noted the crankset had a relatively low Q-factor. It was also one of the stiffest cranks available during the early 1980s. Campagnolo took the the offset spider design one step further on C-Record by utilizing the crankarm itself a a chainring mounting point, though it made chainring removal more difficult.

I realize that a lot of people didn't like the non-standard 1" threads, but it was necessary to increase the number of bearings, in order to carry all of the load on the medial side of the pedal without excess wear rates.

robertj298 

I haven't taken them apart but as far as I know I need the cone side dust cover which is#1 on the diagram

robertj298 

Are they for sale?