Nobody ever said you would. However, the comment regarding 40T
sprockets being the domain of 1x gearing was not confined to the context
of dirt road adventure bikes.
And let's be clear: although neither you nor I are very likely to be
owners of carbon fiber racing bikes, our friends almost certainly will
be. And the time will come when those friends will complain about their
gearing, to us, because they know we are interested in and knowledgeable
about, such matters. And when that time comes, you too will run head on
into the litany of "you can't get there from here" technological
obstacles I mentioned, obstacles that I myself ran into trying to help a
friend in the local bike club.
The friend in question had been to several local shops and they all said
"It cannot be done. Period."
Having researched these issues for about 3 weeks, I finally came upon a
solution, using the Woldtooth Roadlink; she then stumbled onto a shop -
not so local, but no more than an hour's drive from here - where they do
a lot of dirt road adventure bikes. And they came up with the other
solution, using the Wolftooth Tanpan.
So I figured it would be worth mentioning here, as I expect folks here
will find themselves in the same situation I did.
On 09/16/2016 05:38 PM, Patrick Moore wrote:
I agree. You wouldn't choose a carbon fiber racing bike as the base
for building a dirt road adventure bike.
On Fri, Sep 16, 2016 at 10:32 AM, Clayton.sf <clayton...@gmail.com
<mailto:clayton...@gmail.com>> wrote:
Just to clarify,
The way I read the article I it was aimed at touring bikes
(example shows a Hunq) and their appropriate gearing. My response
too was aimed at touring bikes not modern carbon race bikes.
Plenty of triple options for Rivbikes.
Clayton Scott
SF, CA
On Friday, September 16, 2016 at 5:37:24 AM UTC-7, Steve Palincsar
wrote:
On 09/15/2016 11:45 PM, Clayton.sf wrote:
> 40t cogs are the domain of 1x gearing IMO, unless it is an
academic exercise or you are schlepping too much much gear.
22x40 - you would likely be able to walk as fast. And... why
not use at triple at that point. Personally I like short cage
derailers for dirt or none at all and don't go beyond 36 in a
cassette.
In the carbon frame 11 speed era, increasingly 40T sprockets
are the
only way to get gears in the low 20s. Triples aren't an
option because
1) there aren't many, if any, made for the type of bottom
brackets used
on carbon road bikes; 2) integrated brake/shift levers don't
do triples
(either at all, in the case of the higher group levels, or very
successfully); 3) even if you could change crank sets you are
still
stuck with a 50T large chain ring on most of these bikes
because the
front derailleur is mounted on a "braze-on" bracket whose
adjustment
slot is made such that you can't lower the front derailleur at
all.
Along with that 50T big ring comes a 34T small ring.
So where does this leave you? 34 x 32 is now the "standard"
low gear,
and the lowest "road" groups offer. With the 23mm tires these
bikes
have, that's a 28" gear. If you need lower than that, you've
got to go
to larger sprockets, and the next larger sizes are 36 and 40
which give
you 25" and 22", respectively, and you've got to use one of
the two
Wolftooth devices: Roadlink (which will let that 32T capable
road rear
derailleur accommodate a 36T sprocket) or Tanpan, which will
let you use
a Dynasys rear derailleur, which can handle 40T.
None of this is ideal, in that along with those 36 or 40T large
sprockets you get an 11T 1st position, and 50x11 gives you a
120" top
gear - and what anybody who needs a 25 or 22 inch low is going
to do
with a 120" big gear I cannot imagine. The next gear down
with these
cassettes is a 50x13 which isn't so bad - 101" - so I imagine
basically
you treat the 1st position sprocket as a spacer and forget you
have 11
back there.
But basically, with those bikes that is all you can do.
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