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Old December 3rd 19, 05:31 PM posted to rec.bicycles.tech
Frank Krygowski[_4_]
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Default About Bicycles for a change

On 12/3/2019 11:50 AM, Mark J. wrote:
On 12/2/2019 12:03 PM, jbeattie wrote:
On Monday, December 2, 2019 at 10:27:53 AM UTC-8, Tom Kunich wrote:
On Monday, December 2, 2019 at 10:01:21 AM UTC-8, jbeattie wrote:
On Monday, December 2, 2019 at 9:02:27 AM UTC-8, Tom Kunich wrote:
On Sunday, December 1, 2019 at 4:50:30 PM UTC-8, jbeattie wrote:
On Sunday, December 1, 2019 at 3:40:24 PM UTC-8, Tom Kunich wrote:
I have a Redline Conquest cross bike.

I was using flat bars on the bike but cannot stand them and am
changing over to drop bars. This causes me to replace all of the
parts that are on the bike since they are really MTB parts. Thee
are some things that I need that I don't see able to find anymo

1. A compact 175 crankset that has a 24 mm shaft. Is Shimano 105
a proper replacement for the BB386 bearings?

Yes, but you'll need an adapter.
https://wheelsmfg.com/386evo-adapter...no-cranks.html


2. The seat tube is 32.4 mm and I can't find any adapter for the
braze-on front derailleur I have for a compact crank. To fit a
31.8 mm it appears that I would have to force it to the point
that it would scratch the paint off. The clamp on front
derailleur is a 34.8 or whatever with some nylon adapters. These
things are welded to the clamp with time. There must be somewhere
that I can get these plastic adapters or has the almost entire
switch over to CF bikes killed that market?

Google is your friend. 31.8mm clamps are common, and that would
probably accommodate 32.4. Yes, there are plenty on the market.
https://tinyurl.com/v6yfvv3

Also, I'm not getting it -- why do you need a new FD?* If it is
the OE derailleur, it should work with whatever new rear
derailleur/lever set-up you buy, unless it was SRAM and you're
going Shimano. You just move it up a bit to accommodate a 50t
ring. I'm running a 105 compact crank on my CX bike with a 1980s
Shimano 600EX derailleur and it works fine. I might upgrade, but
it wouldn't be required.

This way the bike will double for me as a gravel/cross bike and
when my anti-carbon fiber friend visits I can drop the seat to
the proper level for him. It is pretty odd that most of my bikes
now are what they call Extra-Large or 58 cm. I'm sort of anxious
to get the Basso up again and compare the 62 cm ride to the 58.

There is no reason why you can't restore the bike to its former
glory as a drop bar bike, although it was probably spec'd with a
48t big ring. I'm sure you can find a FD to work.

Olde tyme classic Italiano bikes could be 62cm ctc or ctt, and the
frame would have a 58cm ctc top tube. Too short by current
standards and my person preference. Your 58cm compacts may fit you
better than the old 62cm Basso.

-- Jay Beattie.

1. That adapter does NOT appear to be modifying it for a BB386 but
for a BB50. Where in the hell would you ever find a 386EVO anymore?
Isn't that a FSA standard? They stopped making those a couple of
years ago and no longer have any in stock.

You're always full of trick questions, so I'll just ask: is your BB
threaded?* If not, it is just a 46mm shell bore press fit bearing
with a 30mm ID.* You will need a reducer.* Read this:
https://bikerumor.com/2011/12/22/fsa...rison-weights/


There is no such thing as BB50 -- except as a model number for a
Shimano threaded BB cup.* My commuter is a BB30 with Shimano cranks
and a Wheels Mfg reducer/spacer. You need basically the same thing
without a spacer since BB386 cranks have the same spindle length as
Shimano.
2. The front derailleur is being replaced because it is an MTB top
pull. And I'm selling off the entire Avid hydraulic brakes with the
flat bar and all of the derailleurs and crankset to go with them.
The large ring on that crank is only a 38. The front derailleur has
the curvature to match that tiny large ring.

O.K.

3. You CANNOT put a 31.8 adapter on a 32.4 tube without something
giving. While it might be the adapter, it is more likely to be
denting the seat tube. Looking at it, it appears that the old
derailleur was a 34.9 mm clamp with the plastic adapters.
Apparently the plastic adapters will distort enough to work fine so
I've ordered those.

It really depends on the adapter and if you can adjust the radius
(like a SRAM hanger), but fine, I linked you to a 34.9mm adapter. Go
buy that.

The Basso top tube is 58 1/2 cm C-C. The Lemond (much to my
surprise) is 59 cm and the Colnago is 57 cm. So even with a long
stem the Colnago still has a more upright position. Though the
Colnago does feel better in really fast stuff.

Lemond was known for the longer TT and really started the trend.

-- Jay Beattie.

Trick question? It is a BB386 which apparently means that it is
nominally 386 mm wide and I stated that it is a 24 mm ID. What is
trick about that? I'm not familiar with press-in 386 bottom brackets
but with the multitudes of carbon bikes on the market I wouldn't be
surprised at anything.


No, you stated that you wanted to use a Shimano 105 crank with a BB386
bottom bracket -- which is spec'd with 30mm ID bearings, unless you
have some weird version of BB386. If it is a BB386 with 24mm ID
bearings, just throw the Shimano crank in.* You don't have to do
anything. The crank spindle length for both cranks is the same.


Note to Tom:* "a BB386 which apparently means that it is nominally 386
mm wide" -386 mm is over 15 inches.* That would be a hell of a bottom
bracket.


I was going to say that, but I've resolved to minimize my correction of
Tom's goofs.

--
- Frank Krygowski
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