TTT Forgie/Prima 1999 slip broblems

On 1 Apr 2004 07:11:40 -0800, [email hidden] (Eric Lambi)

Quoted message said:

Hello rec.bicycles.tech:

My bike has a Forgie stem and a Prima 199 handlebar. I have
had a lot of problems with the handlebars slipping and/or
coming loose when I hit a bump or hole in the road. I've
asked two different mechanics about it, but they don't seem
to know how or why this would be a problem. I assumed it
was a problem with the stem, but I've tried two different
Forgie stems, so it is either a design flaw in the stem,
user error, or a problem with the handlebar (don't know
what that would be). Any advice on how to fix this would be
appreciated -- if I need a new stem, recommendations would
be good. I like the 0-rise so that the stem is parallel to
the road.

Thanks!

Eric Lambi [email hidden]

I seem to recall 3T advising sanding the stem and clamp area
of the bar. Also using no grease. Maybe it's in the manual
that came with your stem? Anyway, worked for me.

dianne_1234 said:

I seem to recall 3T advising sanding the stem and clamp
area of the bar. Also using no grease. Maybe it's in the
manual that came with your stem? Anyway, worked for me.

I'm using a Forgie with a Prima handlebar (I'm not sure it's
a 199), with grease and without sanding. No problems so far.
Maybe my handlebar is different from yours.

"frenkatfrenk-do-t_ c0m-p" <"frenkatfrenk-do-t_ c0m-p"@rse-this-if-you.can> wrote in message news:<[email hidden]>...

Quoted message said:

dianne_1234 said:

I seem to recall 3T advising sanding the stem and
clamp area of the bar. Also using no grease. Maybe
it's in the manual that came with your stem? Anyway,
worked for me.

I'm using a Forgie with a Prima handlebar (I'm not sure
it's a 199), with grease and without sanding. No problems
so far. Maybe my handlebar is different from yours.

Apparently 3T still recommend it. From
3ttt.com3tt Ing.PDFOpen ↗

(In translation, the "collar" appears to be the stem's
handle bar clamp. "Clamp" sounds like the stem's steerer
tube clamp.)

"Apply sand paper (av. grain # 100) to remove any rust
inside the collar (smooth off any rough edges). This will
make the surface a little rough and help the parts to adhere
to each other during locking. If the stem is painted, apply
sand paper also inside the clamp (E).

If you have a compressed air blower, lightly apply it on all
the threaded holes to clean them perfectly.

Place the bar inside the head collar, without scratching its
surface; apply the front piece and tighten the screws,
slightly."

...etc.