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2d
comment 25 degree rise stem vs 6 degree rise stem with taller head tube - how is handling affected?
@ojs - Tweaking the wheel base (and front/center length) is one example. If you compare the Soma Stayman vs the Soma ES (both "road sport" geometries) the ES has a much higher stack (3 cm higher on the 56 cm frame) and a longer wheel base and a longer front/center measurement. Soma ES also has a seat tube at a steeper angle effectively moving the rider farther forward, despite having nearly the same reach (+/- 4mm).
2d
comment 9-speed system to 11-speed drivetrain upgrade?
@FredtheMagicWonderDog Pull ratios can be found online. The Maintenance and Repair chapter of the Bicycles Wikibook is one such source.
2d
comment 9-speed system to 11-speed drivetrain upgrade?
Shimano moved to Super SLR pull ratios on their brakes recently so the older brakes will no longer be optimal (see bicycles.stackexchange.com/questions/20295/…)
Feb
2
awarded  Nice Answer
Jan
30
comment 25 degree rise stem vs 6 degree rise stem with taller head tube - how is handling affected?
The frame with the taller head tube will have geometry fine tuning for a more upright rider position.
Jan
30
comment 25 degree rise stem vs 6 degree rise stem with taller head tube - how is handling affected?
the more upright your posture is, the more the center of mass is shifted rearward. Conversely when you get in the drops your body angle is more closed, you shift more weight to the front wheel, and the handling changes as a result.
Jan
30
comment 25 degree rise stem vs 6 degree rise stem with taller head tube - how is handling affected?
A frame with a taller head tube (and taller frame stack) will have small geometry adjustments to compensate for the slight shift in weight distribution towards the rear. Using a stem with a lot of rise will put you in a different body position than was likely intended by the frame designer. The geometry will not be as optimized. Will you notice? Maybe, maybe not.
Jan
23
comment how to design a shaft and gears for shaft driven bicycle
@Mσᶎ - I didn't realize that so many car engines had so little torque. I am not much of a car person.
Jan
23
comment how to design a shaft and gears for shaft driven bicycle
@NhânLê - yes agreed, but torque is what causes shaft wind up and on a shaft driven bike the shaft will experience two wind up and release cycles per pedal revolution which is pretty harsh relative to a drive shaft in an engine, which will experience a wind up at the start of power delivered but will remain wound up due to the more constant power delivery of an IC engine.
Jan
23
comment how to design a shaft and gears for shaft driven bicycle
@Mσᶎ - I believe a bit smaller like a motor scooter or small motorcycle. It will take some work to track down the source. I remember being excited that we at least beat a lawn mower.
Jan
23
comment how to design a shaft and gears for shaft driven bicycle
Great answer. You can add shaft 'wind up' as another disadvantage. Whenever you ride hard you can really notice the shaft twisting under each pedal stroke due to the fact out output is not constant. I remember reading somewhere that our peak torque is higher than a small internal combustion engine. This makes designing a shaft drive difficult due to the need to also keep it light.
Jan
21
comment After conversion, Paramount OS is super squirrely
What handle bar conversion did you do? Drop to straight? Drop to swept back? This can have a large effect on the weight distribution over the front wheel.
Jan
20
comment At what temperature do you say its too cold to ride a bike?
@Batman - I suggest you remove your comment (where you named the service that shall not be named) so they get zero pings from search engines.
Jan
20
comment At what temperature do you say its too cold to ride a bike?
@Batman - I removed the blatant Astroturfing referral to an unnamed service which time and time again has been held to task for their complete lack of morals. Apart from that the question is actually interesting and could be of use.
Jan
20
revised At what temperature do you say its too cold to ride a bike?
Removing blatant advertising. Hands up who hates astroturfing?
Jan
19
comment Crankshaft snags and loses resistance while cycling
A picture of the crank (drivetrain side) could be useful to rule out a Shimano Front-Freewheel System (FFS) which has the freewheel in the crank. When coasting (rolling forward without pedaling) does the chain continue to run?
Jan
19
comment Crankshaft snags and loses resistance while cycling
It is not strictly true that could be a free-hub problem. Years ago there was the Shimano Front-Freewheel System (FFS) which put the freewheel in the crank.
Jan
12
comment Braze on or what sort of clamp on a Cinelli frame?
Take a close look at the picture, the bike already appears to come with a Cinelli branded braze on to clamp adapter. So both descriptions are in a sense correct.
Jan
9
comment Are the Shimano BR650 brakes really Ultegra spec?
Any idea what pull ratio the RG957 work best with, older style Ultegra (e.g., 6600 and below) or the super SLR pull ratio (6700 and greater)?
Jan
9
comment Disc brake freezes up
@madisondan if you do not clarify your question (e.g., temperature scale - 20 degrees centigrade is very warm) this question will be put on hold and forgotten)