Boxerworks.com

Yep ,I'll need to make up a template to exactly the right width to bend around ,

A design that's been rattling around in my brain since the early days of mountain bike riding follows:

You would build a structure from small diameter tubes that approximates the fender. It would attach near the middle of the fender and extend back to the lower edge of the fender. Using that structure to support the functional part of this contraption which resembles a miniature snow plow blade.

The idea would be to shave off the mud before it has a chance to build up. When you are in sticky mud, it can keep building up to the point that the bike becomes unmanageable.

Chuey

Under my guard it would quickly bring her to a halt ,there is just too much room and it's too hard to get out .

Chuey ,I think the brace itself would shave the mud off quite effectively if the guard wasn't there to hold it hard against the tire .

Any possibility of discarding it in favour of a mudguard mounted under the lower fork yoke? (Like a Honda XR600).

I could do but I still need a fork brace and they are essentially R65 forks , stiff but not hugely so .I'd prefer a few inches ,say 2 1/2'' or at least the option to bolt it in a higher position or remove completely in the mud .

DanielMc wrote:

Sibbo wrote:I wonder how the R 80GS forks are set up .........and BTW , thanks for the tip .


It pretty damn flimsy as a fork brace .

IIRC Sibbo, the forks on your ST are straight off the R65 road bike, and as such are a completely different marsupial to the forks fitted to the GS. which, again if memory serves, are the same as the ones fitted to the road-going twin shock R80/R100 from '81 to '84. I reckon the first mudguard in the fiche pic above shows the GS mudguard bolting directly to the underneath of the bottom yoke.

That's pretty much wrong.
The ST front end is for... an ST.
The G/S is the same way, for the G/S
They share some components here and there with other bikes, but are not direct lift offs of any other models.

wirewrkr wrote:That's pretty much wrong.
The ST front end is for... an ST.
The G/S is the same way, for the G/S
They share some components here and there with other bikes, but are not direct lift offs of any other models.

I should have been clearer - the ST front end (instruments, headlight, yokes, sliders, spindle and mudguard), is pure R65. It does have slightly longer stanchions and so the springs will be longer too. Likewise the GS front end shares sliders, yokes and spindle with the twinshock road bikes. It too has slightly diferent stanchions but I have replaced a '81 front end with one sourced from a GS and I couldn't tell them apart.

If by Yokes you mean triple clamps, that is as wrong as a can be.
The R65 triples are much WIDER than the G/S and ST.
they do not interchange in any way. I will say what I said before.
That is just wrong,
Or in gentleman lingo, "you must be mistaken"
Must be an England only spec thing, but I know better than that.

wirewrkr wrote:If by Yokes you mean triple clamps, that is as wrong as a can be.
The R65 triples are much WIDER than the G/S and ST.
they do not interchange in any way. I will say what I said before.
That is just wrong,
Or in gentleman lingo, "you must be mistaken"
Must be an England only spec thing, but I know better than that.

I can't see why you'd think the R65 yokes are wider when both the ST and the R65 use the exact same wheel spindle, headlight bracket and mudguard. I've worked on these bikes and have a fair idea of what fits and what doesn't. Perhaps you'll share your reasons for insisting that "I'm as wrong as can be".

I say it because it's true.
They are approximately .25" wider.
Not only that, but the R65 is of a COMPLETELY different design.
Upper and lower yokes both being of cast aluminum, whereas the ST and G/S were
similar in that they were very similar in design to the standard big twin bikes from 1970-1984.
As a matter of fact they share the same dimensions center to center. The upper is the same type of flat steel as these bikes as well.