Campagnolo 6sp to 7sp freewheel question?

[Tom Nakashima]

Greetings,
tried to put on a Sachs Millard 7sp freewheel on a 126mm Campagnolo Record
rear hub after removing the Sachs Millard 6sp freewheel. Realized I don't
have enough clearance as the 7sp freewheel comes in contact with the right
rear drop-outs. Looks like I need to add a thicker washer on the drive side
of the hub to give me the extra length to accommodate the 7sp. Currently
the hub has two thin washers in-between the lock/adjusting nuts, and when I
mic the total distance in length, it's 126.5mm. What's puzzling me is if I
add a thicker washer to the right side, this makes the126.5 spacing larger
and it may not fit in the frame drops-outs (the frame measure 126mm rear
spacing). Is it possible to eliminate the thin washer on the left side of
the hub and add it to the opposite side, then re-dish the wheel so that it
will accept the 7sp freewheel?

By re-dising to accept the 7sp weaken the axle area?
-tom

 

[[email protected]]

Tom Nakashima wrote:
> Greetings,
> tried to put on a Sachs Millard 7sp freewheel on a 126mm Campagnolo Record
> rear hub after removing the Sachs Millard 6sp freewheel. Realized I don't
> have enough clearance as the 7sp freewheel comes in contact with the right
> rear drop-outs. Looks like I need to add a thicker washer on the drive side
> of the hub to give me the extra length to accommodate the 7sp. Currently
> the hub has two thin washers in-between the lock/adjusting nuts, and when I
> mic the total distance in length, it's 126.5mm. What's puzzling me is if I
> add a thicker washer to the right side, this makes the126.5 spacing larger
> and it may not fit in the frame drops-outs (the frame measure 126mm rear
> spacing). Is it possible to eliminate the thin washer on the left side of
> the hub and add it to the opposite side, then re-dish the wheel so that it
> will accept the 7sp freewheel?
>

Yes, you should only add as much space to the right side as you remove
from the left, keeping the total distance around 126mm. Once you do
that, you will need to redish a little bit. Everything should work out
OK.


> By re-dising to accept the 7sp weaken the axle area?

Yes, it will be a tad weaker. I wouldn't worry about it, unless you
are putting a lot of load on the rear axle - ie, you carry a fair
amount of cargo, or your weight is north of 200 lbs.

Mark Muller

 

[Werehatrack]

On Mon, 11 Jul 2005 07:28:23 -0700, "Tom Nakashima"
<[email protected]> wrote:

>Greetings,
>tried to put on a Sachs Millard 7sp freewheel on a 126mm Campagnolo Record
>rear hub after removing the Sachs Millard 6sp freewheel. Realized I don't
>have enough clearance as the 7sp freewheel comes in contact with the right
>rear drop-outs. Looks like I need to add a thicker washer on the drive side
>of the hub to give me the extra length to accommodate the 7sp. Currently
>the hub has two thin washers in-between the lock/adjusting nuts, and when I
>mic the total distance in length, it's 126.5mm. What's puzzling me is if I
>add a thicker washer to the right side, this makes the126.5 spacing larger
>and it may not fit in the frame drops-outs (the frame measure 126mm rear
>spacing). Is it possible to eliminate the thin washer on the left side of
>the hub and add it to the opposite side, then re-dish the wheel so that it
>will accept the 7sp freewheel?
>
>By re-dising to accept the 7sp weaken the axle area?

Adding spacers to the freewheel side lengthens the distance from the
dropout to the bearing, which increases the amount of strain on the
axle at the bearing due to the increased leverage. So, yes, respacing
the axle will increase the strain on it at the bearing. That said,
lots of people have ridden many miles with 7sp freeheels. If your
frame is steel, I would consider spreading the dropouts and swapping
to a longer axle with added spacers on both sides, rather than
re-dishing the wheel.
--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.

 

[Al Williams]

--

__o
Keep on Ridin' `\ <
(*)/(*)
***********************************************
* Al Williams [email protected] *
* San Jose CA Chief Cyclist, DNRC *
***********************************************
"Tom Nakashima" <[email protected]> wrote in message
news:[email protected]...
> Greetings,
> tried to put on a Sachs Millard 7sp freewheel on a 126mm Campagnolo Record
> rear hub after removing the Sachs Millard 6sp freewheel. Realized I don't
> have enough clearance as the 7sp freewheel comes in contact with the right
> rear drop-outs. Looks like I need to add a thicker washer on the drive
> side of the hub to give me the extra length to accommodate the 7sp.
> Currently the hub has two thin washers in-between the lock/adjusting nuts,
> and when I mic the total distance in length, it's 126.5mm. What's
> puzzling me is if I add a thicker washer to the right side, this makes
> the126.5 spacing larger and it may not fit in the frame drops-outs (the
> frame measure 126mm rear spacing). Is it possible to eliminate the thin
> washer on the left side of the hub and add it to the opposite side, then
> re-dish the wheel so that it will accept the 7sp freewheel?
>
> By re-dising to accept the 7sp weaken the axle area?
> -tom
>

This mod used to be routine when 7 speed was current. I weight 180.
Replacing rear axles also became routine.

 

[Qui si parla Campagnolo]

Tom Nakashima wrote:
> Greetings,
> tried to put on a Sachs Millard 7sp freewheel on a 126mm Campagnolo Record
> rear hub after removing the Sachs Millard 6sp freewheel. Realized I don't
> have enough clearance as the 7sp freewheel comes in contact with the right
> rear drop-outs. Looks like I need to add a thicker washer on the drive side
> of the hub to give me the extra length to accommodate the 7sp. Currently
> the hub has two thin washers in-between the lock/adjusting nuts, and when I
> mic the total distance in length, it's 126.5mm. What's puzzling me is if I
> add a thicker washer to the right side, this makes the126.5 spacing larger
> and it may not fit in the frame drops-outs (the frame measure 126mm rear
> spacing). Is it possible to eliminate the thin washer on the left side of
> the hub and add it to the opposite side, then re-dish the wheel so that it
> will accept the 7sp freewheel?
>
> By re-dising to accept the 7sp weaken the axle area?

add spacers to the right, take them from the left. may have to use a
thinner locknut to accomplish this. Change just enough to get enough
axle on the right, no more. Redish a wee bit to use the 7s is generally
not a big deal.
> -tom