Help identify this bike

For discussions about bikes and equipment.
Brucey
Posts: 34783
Joined: 4 Jan 2012, 6:25pm

Re: Help identify this bike

Postby Brucey » 18 Feb 2019, 7:31am

the nominal capacity of a NR RD is to take a 26T largest sprocket but in practice the largest possible sprocket will vary with the installation, in particular

- the geometry of the tab on the gear hanger
- the chain length (because the top pulley moves relative to the A pivot)
- whether you have 5,6,7,or 8s at the rear; the offset in the RD was meant for 5s; wider clusters see the top pulley swinging upwards towards the low gears.
- what kind of sprockets you are using; HG style ones have shorter teeth than (say) UG type ones; this can be worth about 1T more.
- where the axle is in relation to the gear hanger; in the back of long slotted dropouts can be worth 1-2T more

Each 1T requires about 2mm more clearance. Given that the frame has long slotted dropouts I reckon you would be unlucky to have a big problem running a 6/7s freewheel with HG style sprockets.

BTW IIRC there is more than one way to assemble the A pivot; one of these ways gives more chain wrap and a slightly increased overall capacity.

cheers
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Tao
Posts: 26
Joined: 30 Aug 2016, 5:12pm

Re: Help identify this bike

Postby Tao » 21 Feb 2019, 7:53pm

Is this the same bike as the one advertised on ebay as being a 'Vintage Brian Rourke'?

Linky

Brucey
Posts: 34783
Joined: 4 Jan 2012, 6:25pm

Re: Help identify this bike

Postby Brucey » 22 Feb 2019, 8:29am

I reckon....
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Ke1th
Posts: 40
Joined: 11 Jul 2018, 7:54pm

Re: Help identify this bike

Postby Ke1th » 22 Feb 2019, 2:27pm

I no longer own this bike.