On 09/16/2016 12:32 PM, Clayton.sf 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.
Yes, they are equipped with two very sensible things: round seat tubes
and BSC standard bottom brackets. With those two, you are gold. You
probably won't ever hear someone equipped with a bike like that
complaining about insufficient low gear, because they already have as
low gearing as they could possibly every use with the standard typical
parts that come on those bikes. Sensible for sure.
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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