Author Topic: Five speed  (Read 1235 times)

Offline Norsa1

  • Moving Up
  • **
  • Join Date: Oct 2012
  • Posts: 18
  • Karma: 0
Five speed
« on: 20.01. 2014 16:23 »
I was looking to install a five speed gear cluster in the BSA box.  I have heard that a five speed triumph cluster can be made to fit the box.  Has anyone done this?

Online chaterlea25

  • Wise & Enlightened
  • *
  • Join Date: Jun 2009
  • Posts: 3151
  • Karma: 45
Re: Five speed
« Reply #1 on: 20.01. 2014 17:09 »
Hi,
Yes it can be done if you have access to very good engineering facilities,
The resulting 5 speeder will not have a speedo drive though
There used to be photos on Gold Star Rons website but they seem to be taken down,
You can Email GStarRon@AOL.COM

http://www.ttindustries.com/bsa_gearbox.html offer 5 speed boxes
Along with http://www.novaracing.co.uk/ProductBSAGoldStarTouring.html

If you are building a special its a lot easier to convert a pre unit Triumph box to 5 speed

HTH
John
1961 Super Rocket
1963 RGS (ongoing)

Offline Briz

  • A's Best Friend
  • ***
  • Join Date: Apr 2013
  • Posts: 209
  • Karma: 7
  • West Norfolk UK
    • Custom cycle developments
Re: Five speed
« Reply #2 on: 20.01. 2014 23:06 »
Dont forget that the Triumph 5-speed is basically a close ratio box with 5 gears in the same range as the 4-speed. Great if you're after close ratios, but no good if you want lower cruising rpms.
That Nova stuff looks interesting though.

Online Triton Thrasher

  • Scotland
  • Wise & Enlightened
  • *
  • Join Date: Feb 2009
  • Posts: 1475
  • Karma: 20
Re: Five speed
« Reply #3 on: 20.01. 2014 23:21 »
Dont forget that the Triumph 5-speed is basically a close ratio box with 5 gears in the same range as the 4-speed.

First is lower in the five speed, than in the Triumph four speed.

Quote
Great if you're after close ratios, but no good if you want lower cruising rpms.


"Relaxed cruising" at lower rpm, is a chimaera.

Offline Rocket Racer

  • Wise & Enlightened
  • *
  • Join Date: Jun 2009
  • Posts: 1401
  • Karma: 16
  • A kiwi with a racing A10 rig and too many projects
    • NZ Classic Sidecar Racing
Re: Five speed
« Reply #4 on: 21.03. 2014 05:53 »
The TT industries box is a complete modern replacement box, all current technology and popular with the racing set that have deep pockets, doing 5 and 6 speed, but I believe no speedo drive (??)
The Nova is a set of internals, so more cost effective.
Can't comment on interchangeability of triumph 5 speeders
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
New Zealand

Offline duTch

  • Ricketty Rocketty Golden Flashback
  • Wise & Enlightened
  • *
  • Join Date: Oct 2011
  • Posts: 4540
  • Karma: 41
Re: Five speed
« Reply #5 on: 21.03. 2014 11:07 »

Quote
at lower rpm, is a chimaera.

 Geez TT- had to look that up- best I can find is-;
    " Chimera, ki-me'ra, n.  A fire-breathing monster of fable; a vain or idle fancy'....

Is dat da one...??
 
                                                 *????*
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia