Brompton outer cable lengths

[rogerzilla]

Add to this if you know any others: this information is stupidly hard to find, and it saves buying expensive pre-cut Brompton cable sets.

The exact measurements are on the instructions that come with each cable, or you could measure one that is definitely known to be correct.

M-type, SWB rear brake cable: 1303mm
M-type, SWB rear hub gear cable: 1288mm

The LWB M-type rear cables are approximately 8mm longer (although the wheelbase is more like an inch longer).

[citoyen]

Don't suppose you know the correct length for a front brake cable for an M-type? That's the one I need to know.

d.

[rogerzilla]

Same for SWB and LWB.  Comes in two separate lengths with the cable gatherer sandwiched in between.  But I don't know the actual lengths - I could try and measure, since it's slightly less critical than the rear cables (these don't sit neatly alongside each other, or they foul the chain, if they're not exactly right).

[citoyen]

Only asking out of curiosity, really. Like you say, precise length for front is less critical than for the rear, though I know my front cable is too long - needs at least a couple of inches cutting off.

d.

[Charlotte]

So from this, I take it that I can use the reel of M-Part cable outer I've just sprung for, along with similar cheap generic cables?  That would be a bonus; although the cables are a bit rough, I wasn't going to do them before the BWC.  Now I might...

[rogerzilla]

Yes, but measure the old outers to the millimetre.  Also, if you move the shifter or the brake levers, it messes up the neat cabling.

[iakobski]

QGCABDR-S

LWB, S-Type, Derailleur cable, Brompton trigger/bell

Outer: 1145 mm
Inner: 1269 mm

[Cheysintow]

QGCABDR-S

LWB, S-Type, Derailleur cable, Brompton trigger/bell

Outer: 1145 mm
Inner: 1269 mm

Interesting. Mine is also an S-Type: 3 speed: LWB: but my Housing (125cm) and inner cable is much longer. The stats you posted is what I found they sold at the local store. Though it seem to short for me.

I doubt there any difference from the the brompton shift housing to others( long strands of wire which run parralell to the shift housing): since their made from SRAM. I'm contemplating to cut my own. After all the only differences are:


    YouTube
        - How to Lubricate Brake and Shift Cables
 

Or am I missing something?

[iakobski]

Is yours 3-speed or 6 speed?

[Cheysintow]

3 speed. It was a bespoke Brompton - made to order. I've upgraded the Jagwire to Shimano(shift cable) and waiting for the inner wire(brompton) to be ordered.

[Cheysintow]

2009 LWB.

The inner wire for the 3-speed cable (on an S type bike) is 1411mm long and the outer cable is 1250mm long.

[Pickled Onion]

QBRCABRA-S

Rear brake cable, brompton lever, LWB, S-Type

Outer = 1230 mm
Inner = 1447mm

[LittleWheelsandBig]

QGCABDR-M

Derailleur cable, M-bars, LWB.

Outer = 1187mm
Inner = 1309mm

[LittleWheelsandBig]

QBRCABRA-M/P

Rear brake cable, inclined plastic brake levers, M-bars or P-bars, LWB.

Outer = 1319mm
Inner = 1447mm

[LittleWheelsandBig]

QBRCABFA-M/P

Front brake cable, inclined plastic brake levers, M-bars or P-bars, LWB

Outers = 389mm and 485mm
Inner = 1000mm

[LittleWheelsandBig]

QBRCABFXA-S

Front brake cable for LH front lever, inclined plastic brake levers, S-bars, LWB

Outers = 303mm and 473mm
Inner = 979mm

[LittleWheelsandBig]

QGCAB3A-M(3)

Hub gear cable, M-bars, LWB

Outer = 1302mm
Inner = 1463mm

[LittleWheelsandBig]

QBRCABRXA-S

Rear brake cable for RH rear lever, inclined plastic brake levers, S-bars, LWB

Outer = 1255mm
Inner = 1467mm

[LittleWheelsandBig]

QBRCABFA-M(3)

Front brake cable, 10 degree brake lever, M-bars, LWB

Outers = 389mm and 485mm
Inner = 1050mm

[LittleWheelsandBig]

QBRCABFA-S

Front brake cable for inclined levers, S-bars, LWB

Outers = 332mm and 455mm
Inner = 1050mm

[drossall]

Does anyone know how to gauge this on a non-standard machine? I've got a P, but I have swapped the bars for Joseph Kuosac mid-riser ones, and also swapped to my usual left-hand to front cabling. The original cables are due for replacement and, if anything, I'd say a fraction short. But are there any non-obvious points that determine length? Otherwise I'll buy some generic Jagwire ones and try making them a fraction longer where needed.

It's the references above to cutting to the mm that make me ask!

[Kim]

I've got non-standard bars on mine (S-type with an extender that puts them about halfway to M-height).  I've also got a lifetime's supply of brake outer (because USS recumbents), so I just trial-and-errored it until I found a length that seemed to make the cables cross the main tube of the frame at about the same place, and not cause any problems with folding and steering travel (take photos to compare).  I ended up with a length of cable that was too short to use on the Brompton, but I cut that up to use on a DF bike eventually.

[BillN]

just bought a used Brompton, a 2006 Model

the bars are S bars which are shorter than the standard length

I'm having a problem with the front brake cable rubbing on the wheel especially on a RHS turn

The Bike was fitted with the usual Brompton silver mudguards - no problem with "rubbing" when they are fitted but I've taken them off

will lengthening the cable sure this?

[grams]

Bromptons without mudguards come with one of these to stop the cable rubbing on the tyre:

https://brilliantbikes.co.uk/brompton-folding-detail/835-brompton-cable-fender-disc-for-bikes-without-mudguards.html

You'll see an eyelet for it on the back of the left fork.

[BillN]

Bromptons without mudguards come with one of these to stop the cable rubbing on the tyre:

https://brilliantbikes.co.uk/brompton-folding-detail/835-brompton-cable-fender-disc-for-bikes-without-mudguards.html

You'll see an eyelet for it on the back of the left fork.

Thanks - much appreciated