Compact CrankSET - or just RINGS?

Quoted message said:

Are the cranks/spider of a compact crankset the same as a standard
crankset

No, they're smaller.

Zog The Undeniable said:

Quoted message said:

Are the cranks/spider of a compact crankset the same as a standard
crankset

No, they're smaller.

Little extra info . . . for your viewing pleasure, and--yes--there
will be a quiz:

http://www.webcyclery.com/pages.php?pageid=11

gkaton said:

Are the cranks/spider of a compact crankset the same as a standard
crankset, so I could just switch my 53/39 rings for compact rings, or
do I really need to get special cranks/spider for the smaller
chainrings?

What is referred to as a "compact" crankset (road) is one with a 110mm
bolt circle diameter. These are old-style mountain bike type, which are
basic touring equipment. Rumor has it that Campagnolo's compact cranks
have a slightly different size bolt circle, so (they say) they are not
compatible with the vast amount of 110mm stuff floating around. If so, it
figures.

Yes, the bolt circle is smaller than your standard road cranks, so you
will need new arms as well as rings. But they can be found cheaply by
looking for touring gear or old mountain bike gear (those then would be
triples). They can also be had more expensively under the name "compact
road". Those are also sexier, and maybe a bit lighter.

--

David L. Johnson

__o | What is objectionable, and what is dangerous about extremists is
_`\(,_ | not that they are extreme, but that they are intolerant.
(_)/ (_) | --Robert F. Kennedy

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Quoted message said:

Are the cranks/spider of a compact crankset the same as a standard
crankset, so I could just switch my 53/39 rings for compact rings, or
do I really need to get special cranks/spider for the smaller
chainrings?

Campagnolo chainrings have a bolt circle of 135 mm.
Shimano has a bolt circle of 130 mm.

Compact has a bolt circle of 110 mm.

Compact RULES if you live in an area of climbing enough so that a triple
might be a good idea for you. They shift all hell and gone better than a
triple (and will be even better if you can finally get a compact Front
Derailleur) and a decent rider can use all of the gears on his cluster most
of the time.

"David L. Johnson" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

gkaton said:

Are the cranks/spider of a compact crankset the same as a standard
crankset, so I could just switch my 53/39 rings for compact rings, or
do I really need to get special cranks/spider for the smaller
chainrings?

What is referred to as a "compact" crankset (road) is one with a 110mm
bolt circle diameter. These are old-style mountain bike type, which are
basic touring equipment. Rumor has it that Campagnolo's compact cranks
have a slightly different size bolt circle, so (they say) they are not
compatible with the vast amount of 110mm stuff floating around. If so, it
figures.

Not a rumor! On the Campy "compact" cranks, 4 of the 5 chainring bolts are
at 110bcd. However, the one that goes behind the crank arm is at 112mm, not
110mm! Got to be different.

Here's Andy Muzi's excellent write up:

Quoted message said:

Quoted message said:

The question then is does the Campy CT compact have a 110mm bolt circle

diameter? If so, that's great news and contrary to alot of others who
stated
that it would be some weird proprietary bolt pattern like 112mm or
112.5mm.....

I had heard that rumor, too.

I measured the crank last Friday, wrote the web page but
didn't try to change a ring until today. Should have
measured more carefully.

The crank is indeed _mostly_ 110mm. The one bolt inside the
arm is at 112mm. (I can't recall any other asymmetric drill)

Here's the crank with a Sugino ring:
http://www.yellowjersey.org/ph­otosfromthepast/CAFCCOMP.JPG

Here's how it doesn't work:
http://www.yellowjersey.org/ph­otosfromthepast/CAFCCOMX.JPG

Here's the tool:
http://www.yellowjersey.org/ph­otosfromthepast/SHAPER.JPG

With such a shaper positioned inside the existing chainring
bolt hole at the proper depth, push the ring across the
table of the drill press 2mm (use stops so the ring can't
spin!), There's no inner chainring seat or land below that
bolt so, even though the Campagnolo ring is relieved (on the
inside edge) you needn't trim that part of your replacement
ring.

David L. Johnson said:

What is referred to as a "compact" crankset (road) is one with a 110mm
bolt circle diameter. These are old-style mountain bike type, which are
basic touring equipment.

I think that Sugino among others made 110 bolt pattern doubles before
MTB bicycles existed. I use a Sugino Might Tour and I think it is
from the 1980s.

Paul Kopit said:

David L. Johnson said:

What is referred to as a "compact" crankset (road) is one with a 110mm
bolt circle diameter. These are old-style mountain bike type, which are
basic touring equipment.

I think that Sugino among others made 110 bolt pattern doubles before
MTB bicycles existed. I use a Sugino Might Tour and I think it is
from the 1980s.

I didn't mean to suggest otherwise. Yes, the 110mm bolt circle was
standard touring fare before mountain bikes existed, as were even smaller
bolt circles like TA.

--

David L. Johnson

__o | You will say Christ saith this and the apostles say this; but
_`\(,_ | what canst thou say? -- George Fox.
(_)/ (_) |

"David L. Johnson" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Paul Kopit said:

David L. Johnson said:

What is referred to as a "compact" crankset (road) is one with a 110mm
bolt circle diameter. These are old-style mountain bike type, which are
basic touring equipment.

I think that Sugino among others made 110 bolt pattern doubles before
MTB bicycles existed. I use a Sugino Might Tour and I think it is
from the 1980s.

I didn't mean to suggest otherwise. Yes, the 110mm bolt circle was
standard touring fare before mountain bikes existed, as were even smaller
bolt circles like TA.

There was an old triple touring "standard" of 110 for the top two rings and
73 for the granny.

David L. Johnson said:

gkaton said:

Are the cranks/spider of a compact crankset the same as a standard
crankset, so I could just switch my 53/39 rings for compact rings, or
do I really need to get special cranks/spider for the smaller
chainrings?

Quoted message said:

Yes, the bolt circle is smaller than your standard road cranks, so you
will need new arms as well as rings. But they can be found cheaply by
looking for touring gear or old mountain bike gear (those then would be
triples). They can also be had more expensively under the name "compact
road". Those are also sexier, and maybe a bit lighter.

I use an old Stronglight 99 with 32-45 rings:

http://www.os2.dhs.org/pictures/gallery/bikes/dsc02798

--

John ([email hidden])