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  1.  quote

    I've just got a set of Ambrosio wheels (both sides fixed instead of standard fixed/free flip-flop) and will be putting on my new sprockets.

    I am also intending to switch my current 42t chainring for a 48t. One gear I want to run is 48x18 (approx 72") - currently running 42x16.

    As a bit of a mechanical berk, can somebody tell me how much extra chain am I likely to need for this and/or will it be best to just go & buy a new 1/8" chain too?

    Thanks in advance.

    •  
      CommentAuthoreuan
    • CommentTimeJul 2nd 2009
     quote
  2.  quote

    I'd go for a new chain.......you don't want 2 connections on one chain. SNAP!

    •  
      CommentAuthorrusty
    • CommentTimeJul 2nd 2009
     quote

    48x18 is 72" exactly (gear inches are quoted in terms of a 27" nominal wheel and not your actual tyre size. Using your tyre size is like guessing the length of a table and giving an answer to 3 significant figures). 48x18 is a great gear. I ran it for about a year and a half until I changed today. There's no real reason to get a new chain unless you have no links. If you need extra links then I'd say get a new chain.

    Monkeytrousers:I'd go for a new chain.......you don't want 2 connections on one chain. SNAP!

    What do you mean? 2 connections in a chain? My chain has been broken at about 15 different links. do you mean masterlinks? If so, you don't need to put in another. Just lengthen the chain with a chain tool.

  3.  quote

    The single speed chains I've used are KMC, ones got the standard spring link like a BMX and the other is a bit like a Sachs powerlink. I don't fancy just joining a chain using a chain tool..........unless you haver a brand new pin like the Shimano HG ones(chain specific).......you push thro with chain tool then break off extra portion. Do link pins exist for use with a chain tool?............Remember I'm a mountain biker, we use different chains.

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      CommentAuthorrusty
    • CommentTimeJul 2nd 2009
     quote

    Monkeytrousers:The single speed chains I've used are KMC, ones got the standard spring link like a BMX and the other is a bit like a Sachs powerlink. I don't fancy just joining a chain using a chain tool..........unless you haver a brand new pin like the Shimano HG ones(chain specific).......you push thro with chain tool then break off extra portion. Do link pins exist for use with a chain tool?............Remember I'm a mountain biker, we use different chains.

    Traditional solid pinned track/single-speed chains are fine for joining with a chain tool repeatedly. They're not mushroomed much at all so breaking and re-joining doesn't make bad shit happen.

  4.  quote

    Will make a note of that for my forthcoming Mercian build. Cos there's every chance I'll make a James Hunt of the gearing and have to change the chain length.

    •  
      CommentAuthoreuan
    • CommentTimeJul 2nd 2009
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    Even 48x16 is fine in Glasgow. Just gotta take your time on the hills.

    •  
      CommentAuthorrusty
    • CommentTimeJul 2nd 2009
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    euan:Even 48x16 is fine in Glasgow. Just gotta take your time on the hills.

    Don't know. That gear is a favourite of some but It's a bit steep for most.

    •  
      CommentAuthorplurabelle
    • CommentTimeJul 2nd 2009
     quote

    euan:Even 48x16 is fine in Glasgow. Just gotta take your time on the hills.

    That's what I'm on, and yeah, I only have a problem when i leave Glasgow city centre.

    but seeing as I'm doing that more often, I'm going to change down.

    •  
      CommentAuthoreuan
    • CommentTimeJul 2nd 2009
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    You did fine on the way out to Eaglesham though like.

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      CommentAuthortrailstar
    • CommentTimeJul 2nd 2009
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    im running 44-15 and its perfect :)

    •  
      CommentAuthorplurabelle
    • CommentTimeJul 2nd 2009
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    euan:You did fine on the way out to Eaglesham though like.

    Found it pretty tough, in all honesty. Way back was amazing, though.

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