Retrobike Forum Index

It is currently Sat Dec 03, 2016 9:00 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 20 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: Tue Dec 06, 2011 12:52 am 
Gold Trader
Gold Trader
User avatar

Joined: Wed Nov 24, 2010 11:57 am
Posts: 1634
Location: South Hams - Devon
Having got my unknown "Titanium Frame" from Ebay a couple of weeks back and with the help of several fellow RBers identified it as an Airborne Lancaster [EDIT 07/12 - or maybe it isn't !] I have decided to try something completely different and build up a single speed. Never tried it, ridden one or seen one in the metal but lets have a go. :) Having parted company with my previous titanium frame - a Merlin '93 - due to disc brake related dilemmas, this one is going to get the non retro treatment (as much as I can sensibly afford) so it can be geared up later and become my trail bike in the future. I also have a bit of a liking for gold so "Blinglespeed" it is.
If anyone with SS knowhow would like to offer some guidance on ratios - do I want a 16/18/20T ? - and chains - do I need a special single speed chain or can I use a 9 speed one I have ? - and tensioners - do I need one really ? - and chainset - is it ok to use a triple but with just the middle ring ? - then it would be most welcome !
Here's where I'm at at the mo. Frame plus Bontrager Switchblades, Hope headset, gold Hope stem and seatclamp and a remnant of the Merlin in the shape of Syncros post 'cos its the right size.


Attachments:
Airborne frameset resized.jpg
Airborne frameset resized.jpg [ 108.54 KiB | Viewed 2165 times ]


Last edited by trek_y on Wed Jan 25, 2012 12:40 pm, edited 5 times in total.
Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 06, 2011 9:16 am 
Retro Guru
User avatar

Joined: Tue Aug 07, 2007 12:22 pm
Posts: 2942
Location: Platsa, Messinias, Greece
I don't know if any of this will be any use to you but you never know.....

Ratios - depending on what sort of riding terrain you have, obviously, but I'd start with a 32 tooth chainring (it's more or less the law :wink:) and an 18 tooth sprocket and take it from there. If the climbs are too hard then go to 20T, at least to start with until you get into it more.
Just deal with spinning out at 16mph on the flats - it'll get you used to spinning high cadences. Unless of course everywhere you ride is flat - if it is, then you can gear up accordingly (like a 16 or 15 tooth sprocket).

Have you decided what cranks you'll be using? Rather than just use the normal middle ring on a triple I'd replace it with a singlespeed chainring, in the interests of greater chain security. In other words, one with full depth teeth. Something like this.

You'll need some way of adjusting chain tension and if you use a tensioner that fits on the mech hanger go for one that is fixed rather than the spring loaded type.
This sort Image

rather than this sort Image

The neatest solution (IMHO) is an eccentric bottom bracket (EBB) converter like the Forward Components or Trickstuff Eccentriker. Both of these need an external BB type crankset.

Excentriker and Forward Components review here.

However, I believe that the FC is no longer in production - I do know of an Excentriker going spare though :wink:.

The best chain, in my not-so-humble opinion is the KMC Z610 HX This one.

Wideish bars (660mm+) are a big advantage (or I think they are) and don't shove the saddle back too far - I find that it's easier to spin high RPM's with it further forwards and you don't need power in the saddle as any time that there's any appreciable climbing you'll be out of the saddle anyway.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 06, 2011 10:50 am 
Old School Grand Master
User avatar

Joined: Fri May 01, 2009 7:11 pm
Posts: 8479
Location: Fircombe.
There's more than one way to skin a cat, so I'll disagree with Andy over the ratios. :P His hills are bigger than mine though.
I run 33;17 on one bike and despite very little different to 34;17, it feels a lot easier, but still gets you places on the flat! It also has the advantage that with a 16.75" chainstay (pretty common) , you will need no tensioner with a very lightly worn chain.
I haven't used an Excentrika BB though I do run a Forward Components one, and highly recommend them. They are pretty easy to adjust and don't creak like some "proper" oversize EBBs. They don't have the same range of adjustment, so ratios still need some thought, or a half link.
Do get an SS specific cog and chainring, of equal wear, if not new, and a similar chain, though SS is not necessary. Correct chainline is crucial though, and with Velosolo spacers is easy to achieve.
SSing is addictive though. It makes life just that little less complicated, which can't be bad!

Plug your gear ratios in here: http://eehouse.org/fixin/formfmu.php

to make it complicated again.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 06, 2011 10:55 am 
Gold Trader
Gold Trader
User avatar

Joined: Wed Nov 24, 2010 11:57 am
Posts: 1634
Location: South Hams - Devon
That is brilliant info thanks very much ! :D
I'm planning to give this a try without too much initial expense so will use my current chainset reduced to just its 32T middle ring and see you can pick up a SS conversion kit for about a tenner. So I'll plump for a 16T I think as this is intended to be more a trail and road bike. I presume this will work with a spare 9 speed chain I have ?
If the SS bug bites then I'm relived to see that a proper conversion with a middle ring, chain and non sprung tensioner shouldn't cost too much - although that Excentriker is a beautiful piece of kit so maybe Santa will bring it for me ! (send me a PM Andy :wink: )
Or if anyone just happen to have an equally worn middle, cog and chain going then I'm definitely interested.


Last edited by trek_y on Tue Dec 06, 2011 11:00 am, edited 1 time in total.

Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 06, 2011 10:59 am 
Retro Guru
User avatar

Joined: Tue Aug 07, 2007 12:22 pm
Posts: 2942
Location: Platsa, Messinias, Greece
suburbanreuben wrote:
There's more than one way to skin a cat, so I'll disagree with Andy over the ratios. :P His hills are bigger than mine though.


And he's old and feeble too :wink: There, fixed that for you......

If you need a half link then this is the only one worth bothering with -
Image

From here.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 06, 2011 11:09 am 
Old School Grand Master
User avatar

Joined: Fri May 01, 2009 7:11 pm
Posts: 8479
Location: Fircombe.
If you can get SS specific stuff, then it's well worth it. There's usually someone deciding that SS is not for them , selling some kit on. Similarly, if you decide you're not man enough, it's easy to sell. :wink:
If your chain does slip, this could be the result! :shock:
http://www.retrobike.co.uk/forum/viewto ... =aubergine


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 06, 2011 11:16 am 
Gold Trader
Gold Trader
User avatar

Joined: Wed Nov 24, 2010 11:57 am
Posts: 1634
Location: South Hams - Devon
:lol: point taken !


Top
 Profile  
 
 Post subject:
PostPosted: Tue Dec 06, 2011 11:36 pm 
Gold Trader
Gold Trader
User avatar

Joined: Wed Nov 24, 2010 11:57 am
Posts: 1634
Location: South Hams - Devon
Some more shiny bits for the build 8)


Attachments:
bling.jpg
bling.jpg [ 142.44 KiB | Viewed 2053 times ]
Top
 Profile  
 
 Post subject:
PostPosted: Wed Dec 07, 2011 6:12 pm 
Gold Trader
Gold Trader
User avatar

Joined: Wed Nov 24, 2010 11:57 am
Posts: 1634
Location: South Hams - Devon
Well apparently after some more great input from RB what I have here is not a Lancaster but a Mosquito. 8) Going to put some more of it together hopefully tonight.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Dec 09, 2011 4:21 pm 
Sabrina the Teenage Witch
User avatar

Joined: Fri Jan 25, 2008 2:23 pm
Posts: 720
Location: Mammoths deserve to be cloned. From what I've seen in 'Ice Age' they are jolly good sports.
trek_y wrote:
Some more shiny bits for the build 8)


Image


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 20 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: boo and 13 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