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Thread: Push Bike question - from Dérailleur changer

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    Push Bike question - from Dérailleur changer

    Has anyone seen one of those front Dérailleur rod changers - the manual one where you put your hand down and twisted a rod to change front chainrings

    I had one on my Uppadine Bike years ago, (early 1960's) - made by campag - but they were quite common at the time

    could one be easily made plus a clip on 43mm in diameter? - it's quite a simple thing - just for two front Chainrings

    I'm trying to figure out how to put two chainrings on a Brompton - the two chainring part is easy - it's the changer that will be difficult - the tubes on the Brompton are 45mm, or is it 43mm in diameter and there is no room

    paragon

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    You may already know this but if not.....

    Customising/what will/what won't fit etc etc on Bromptons.....

    Brompton – Kinetics




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    Why two chainrings?
    It feels like you are overcomplicating the whole thing. What you really need is an Alfine (like Rohloff but way cheaper) 8 or 11 speed hub gear. Simple, wide gear range. Effective

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    Quote Originally Posted by Davey B View Post
    Why two chainrings?
    It feels like you are overcomplicating the whole thing. What you really need is an Alfine (like Rohloff but way cheaper) 8 or 11 speed hub gear. Simple, wide gear range. Effective
    Not really as I am after the "lightest" 6 speed set up

    The rear end of the Brompton with not take a normal Dérailleur - you have to modify the Brompton "Chain pusher" which is only built for a two sprocket rear set up

    There is only room for 3 "10 Speed" type sprockets on the rear, (just about take up the same space as two SA sprockets) - I just need a Shimano 10 speed Cassette and then use the 13t 15t and 17t - 17 is the biggest that the back will take without affecting the fold

    I have the Alfine spyder/cranks/BB - and the (Outer) Chainring is Middleburn

    I have spend hours looking thru the web for options

    (the Brompton alternative is a 3 speed rear SA type Hub and two SA sprockets, plus their "chain pusher = about £350)

    Thanks - was aware of Rohloff, as you say very expensive ..............was not aware of the Shimano 8 speed Hub - presumably it can be built into a 16" wheel - is it the same width as a SA Hub
    paragon

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    Quote Originally Posted by jonnie comet View Post
    You may already know this but if not.....

    Customising/what will/what won't fit etc etc on Bromptons.....

    Brompton – Kinetics




    Thanks Jonnie - Kinetics are really expensive, and I'm not sure why?

    (maybe it's the "London" Brompton market!!)
    paragon

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    Quote Originally Posted by Davey B View Post
    Why two chainrings?
    It feels like you are overcomplicating the whole thing. What you really need is an Alfine (like Rohloff but way cheaper) 8 or 11 speed hub gear. Simple, wide gear range. Effective
    Just checked it out Davey

    for the Afine hub you need a rear frame spacing width of 135mm ....... the Brompton is 115mm so a new "rear triangle" is needed - Kinetics do them at £400 or £725 for a new triangle, Alfine Hub and changer.

    The easiest way to get 6 speeds is the Brompton SA way = about £350 - Rear Hub and two sprockets

    my way, if it works should be cheaper and lighter
    paragon

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    Quote Originally Posted by BillN View Post
    Just checked it out Davey

    for the Afine hub you need a rear frame spacing width of 135mm ....... the Brompton is 115mm so a new "rear triangle" is needed - Kinetics do them at £400 or £725 for a new triangle, Alfine Hub and changer.

    The easiest way to get 6 speeds is the Brompton SA way = about £350 - Rear Hub and two sprockets

    my way, if it works should be cheaper and lighter
    Blimey, know nothing about Bromptons and at prices like that (and no need for a small wheeled folder) I'll stick with 'bigger' bikes. Good luck

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    Just waiting for my second Brompton to arrive - being shipped from the UK to France - TNT - £70 - hope it doesn't explode

    Black Edition M6L
    paragon

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    Quote Originally Posted by BillN View Post
    Just waiting for my second Brompton to arrive - being shipped from the UK to France - TNT - £70 - hope it doesn't explode

    Black Edition M6L
    I DO NOT want a second Brompton...My Brirish racing green M6L is a beaut'

    BUT...That orange S3L..(only done ten miles)...for sale elsewhere on here is so so tempting......Wish I had gone with the S bars in the first place...

    Enjoy the M6L BillN.....

  10. #10
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    Quote Originally Posted by jonnie comet View Post
    I DO NOT want a second Brompton...My Brirish racing green M6L is a beaut'

    BUT...That orange S3L..(only done ten miles)...for sale elsewhere on here is so so tempting......Wish I had gone with the S bars in the first place...

    Enjoy the M6L BillN.....
    The Orange S3L is a good buy, (I would have had a go had it been nearer and I think Gerry wants it collected rather than shipping it) ....... go for it and try the nano electric assist kit for £800 - runs on Bosch 36v power tool batteries, (£100) - probably 10 miles per battery - but they are not heavy so you can carry 2 - I may have a go with a kit in a couple of months time
    paragon

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