Retrobike Forum Index

It is currently Sun Dec 04, 2016 11:49 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 44 posts ]  Go to page Previous  1, 2, 3, 4, 5  Next
Author Message
 Post subject: Re: One word for you...
PostPosted: Sun Apr 28, 2013 10:55 am 
98+ BoTM Winner / Gold Trader
98+ BoTM Winner / Gold Trader
User avatar

Joined: Tue Feb 14, 2006 9:58 pm
Posts: 3520
Location: the Netherlands
Chopper1192 wrote:
Sensitive to servicing - yes, shifting performance will degrade through lack of serving, but it takes some mileage. However, once they have been allowed to get that far they need a specialist overhaul - I'm Cytec qualified and have an MSc in a field of physics, and there ain't no way I'd consider a full strip, though a basic oil-bath service is within the scope of many riders

Shifting performance gets better when they wear in, sevice once a year with changing the oil bath (I know of people riding their hub without doing this for over 4 years) and maybe chaning the shifting cables.

Chopper1192 wrote:
And yes, I've had one fail on me terminally, believed by the repairing agent because a 116kg powerlifter wad managing to put too much torque though it in the lower gears - the internals had simply churned into a metallic mush. They do recommend a max rear sprocket size to prevent torque damage, but being quite weighty and being able to squat over 3 times my own weight it seems I managed to exceed even the official safe limit. yes, working in an area of the trade as I do its not the only failure I've come across, although you'll never encounter many because only a tiny proportion of bikes have them.


When you "under gear" your Rohloff or can produce more power than 2 Chipolini's in full sprint together the plastic guiding washers will break as a back-up safety. I've never seen this happen though.

Chopper1192 wrote:
Indestructible and everlasting they are not. Probably tougher, within limits, than the typical derailleur, but when your mech goes south you'll be sorting it on your kitchen table, possible fire cost if only cleaner and lube - unless you're Adam Steltzner you ain't gonna be fixing a Rohloff in the kitchen, and if it's busted isn't gonna cone back with a strip and clean.


Agree, nothing mechanicly is indestructable, but the ods of a Rohloff failing on you is so small I would travel the world with it without spares.

Chopper1192 wrote:
PS, when will people stop quoting Sheldon? Nice albeit I'm sure, but reports are that his trousers went on one leg at a time each morning, same as everyone else's.


as you would have read it you would know it was written by Andy Blance not by SB ;)


Top
 Profile  
 
 Post subject: Re: One word for you...
PostPosted: Sun Apr 28, 2013 11:00 am 
98+ BoTM Winner / Gold Trader
98+ BoTM Winner / Gold Trader
User avatar

Joined: Tue Feb 14, 2006 9:58 pm
Posts: 3520
Location: the Netherlands
Chopper1192 wrote:
Can't have a lubrication failure? Utter rubbish.

Even if not a drop leaks out you can still suffer a lubrication failure. Go read up on 'shear'.


Sorry to proof you wrong, they're designed to run on the oil that sticks to the system, but tell me, if you'd won the lotto, would you buy one to try yourself before making claims ..... guess not :roll:


Top
 Profile  
 
 Post subject: Re: One word for you...
PostPosted: Sun Apr 28, 2013 11:07 am 
98+ BoTM Winner / Gold Trader
98+ BoTM Winner / Gold Trader
User avatar

Joined: Tue Feb 14, 2006 9:58 pm
Posts: 3520
Location: the Netherlands
sorry for going OT for so long btw :oops:


Top
 Profile  
 
 Post subject: Re: One word for you...
PostPosted: Sun Apr 28, 2013 11:20 am 
Old School Grand Master
User avatar

Joined: Wed Apr 12, 2006 12:33 pm
Posts: 11105
Location: The Home Of Mountain Biking, And All Great Things.
This has been done before, but I am game.

It is only a matter of time before the SS brigade jump in and argue neither system is ideal, and we all should discard gearing completely. ;)

Purely based on logic, I would agree the ideal is to conceal any part of the cycle that might become inefficient due to the conditions.

Preferably an entirely sealed system, from the front to the back.

Hub gears and bottom bracket internal gears seem to be the way forward, retaining chain drive for its efficiency.

It is a question of materials and design changes to make things lighter. I am sure that we shall see huge improvements in this area soon.

Meanwhile classic dérailleur systems offer a lightweight alternative to what are still heavy and expensive systems.

I haven't heard of Rohloff being unreliable; in fact quite the opposite. I wouldn't consider one for an extended touring bike though, as the only problems I have ever had with dérailleurs have been easily amended on the road, and carrying complete spares is a matter of a few hundred grams. My interest in sealed systems is for true off road riding, that is where the advantages should shine through. That, and town bikes/cruisers where ease of use and convenience of low maintenance come into play. The price must come down though.

I don't see the tandem evolution of dérailleurs as illogical, for the foreseeable future they are the sensible alternative for most of us.

One other thing. I just don't want my bike, especially touring, to have such an obvious expensive item on it.

Insurance sorts out a new bike. I have other bikes though, I just don't want to be inconvenienced and anything that adds to the desirability for a thief is out for me.

Besides, scratched up old XT or XTR is light and highly efficient.


Top
 Profile  
 
 Post subject: Re: One word for you...
PostPosted: Sun Apr 28, 2013 4:33 pm 
Old School Grand Master
User avatar

Joined: Sun Aug 21, 2011 11:57 pm
Posts: 4074
Location: Antwerp, Belgium
Chain drive efficient? Only about 98% or so, and that is in ideal conditions. Insufficient lubrication or dirt will quickly reduce that percentage.
IMO the future lies with a combination of internal gearing (bottom bracket based, to reduce unsprung weight) and hydraulic drive.


Top
 Profile  
 
 Post subject: Re: One word for you...
PostPosted: Sun Apr 28, 2013 5:44 pm 
Gold Trader
Gold Trader
User avatar

Joined: Thu Nov 09, 2006 11:19 pm
Posts: 1854
Location: Gwlad Gwlad to be here
I like my ZEE.

I did try a Rohloff hub for a while a couple of years back. I like my bikes to be as simple as possible (no rear suspension) and ride with a single ring up front. Every bit of me wanted to like the system but I couldn't get on with how the weight was distributed on the bike and the manky gripshift. I don't find any problems with modern derailleur systems - in fact they are getting better and better as far as I can tell.

I've done cross races so muddy that the wheels will hardly turn in the frame - but the derailleur gears carried on working.

I recently saw a bike (think it was Demon Frameworks) where the Rohloff hub had been mounted within the diamond of the frame (just above the bottom bracket) and used as gear box. Incredibly ugly but it seemed to solve the weight distribution issue.

It'll be a long time before I'm tempted back to trying hub gearing.


Top
 Profile  
 
 Post subject: Re: One word for you...
PostPosted: Sun Apr 28, 2013 6:46 pm 
Old School Grand Master
User avatar

Joined: Wed Apr 12, 2006 12:33 pm
Posts: 11105
Location: The Home Of Mountain Biking, And All Great Things.
Raging_Bulls wrote:
Chain drive efficient? Only about 98% or so, and that is in ideal conditions. Insufficient lubrication or dirt will quickly reduce that percentage.
IMO the future lies with a combination of internal gearing (bottom bracket based, to reduce unsprung weight) and hydraulic drive.


Yes, chain drives are generally exceptionally efficient. It is possible to enclose them in many cases, minimising drop off due to poor condition.


Top
 Profile  
 
 Post subject: Re: One word for you...
PostPosted: Sun Apr 28, 2013 7:59 pm 
Old School Grand Master
User avatar

Joined: Fri May 01, 2009 7:11 pm
Posts: 8479
Location: Fircombe.
highlandsflyer wrote:
This has been done before, but I am game.

It is only a matter of time before the SS brigade jump in and argue neither system is ideal, and we all should discard gearing completely. ;)


.
So , as well as worrying whether you're in the right gear, you have to worry about whether you have the right gear system?
It amazes me you girls ever get to go outside, these hard choices you have to make , an' all...


Top
 Profile  
 
 Post subject: Re: One word for you...
PostPosted: Sun Apr 28, 2013 8:49 pm 
Retro Guru

Joined: Tue Jan 06, 2009 12:41 pm
Posts: 268
Location: Northumberland-land
How much do they cost? How many SLX/XT/nonsense from SRAM mechs is that?


Top
 Profile  
 
 Post subject: Re: One word for you...
PostPosted: Sun Apr 28, 2013 9:54 pm 
Old School Grand Master
User avatar

Joined: Wed Apr 12, 2006 12:33 pm
Posts: 11105
Location: The Home Of Mountain Biking, And All Great Things.
suburbanreuben wrote:
highlandsflyer wrote:
This has been done before, but I am game.

It is only a matter of time before the SS brigade jump in and argue neither system is ideal, and we all should discard gearing completely. ;)


.
So , as well as worrying whether you're in the right gear, you have to worry about whether you have the right gear system?
It amazes me you girls ever get to go outside, these hard choices you have to make , an' all...


Being a girl is great.

Single speeds are for the flatlands.

Boo ha!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 44 posts ]  Go to page Previous  1, 2, 3, 4, 5  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: jruk, Kona-Ian, Midlife and 23 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group