James Thomson wrote on 27/06/2006 23:34 +0100:
> "Tony Raven" <[email protected]> a écrit:
>
>> James Thomson wrote on 27/06/2006 17:34 +0100:
>
>>> The Brompton's back end isn't narrower than most traditional hub-geared
>>> bikes, so a standard Sturmey or SRAM coaster hub will fit. The problem is
>>> that you can't use a coaster brake with a chain tensioner, and the
>>> Brompton needs its chain tensioner to fold.
>
>> ITYM it is narrower than other bikes - 112mm IIRC vs typically 120mm+
>
> Not at all. You may be familiar with derailleur bikes with wider rear ends,
> but in the world of hub gears, coasters, and single speeds (being the
> context), 112mm isn't particularly narrow.
My apologies. When you wrote "traditional hub-geared bikes" I thought
you were referring to the bikes being traditional not the hub gears.
Yes you may be able to find old style SA hubs that fit the Brompton and
there are even three speed hubs still available from SA and SRAM, but
try finding any other current hub gear that fits a Brompton rear as
standard. Rohloff, SRAM, Shimano, SA, none of them fit without
resetting the rear triangle (possible on the steel but essentially
impossible on the Ti triangle).
>
> http://www.users.globalnet.co.uk/~hadland/sa/safitadj.pdf
>
> The over-all width of Sturmey-Archer rear hubs over the cone locknuts,
> as supplied from the Works, is 4 5/16" [109.5mm]. If necessary, it can
> be reduced to 4 1/16" [103.2mm] by removing the spacing washer on
> the left-hand side and the cone locknut on the right-hand side.
If you are going to look at the SA range, at least look at the current
range -
http://www.users.globalnet.co.uk/~hadland/sturmeyupdate.pdf
Tony Hadland's site is full of historical stuff but even then AFAIK only
the 3 and 5 speed hubs were available in a size that fitted the Brompton
rear.
--
Tony
"Anyone who conducts an argument by appealing to authority is not using
his intelligence; he is just using his memory."
- Leonardo da Vinci
