Converting a 2 speed to 3 speed - non IGH
Stock hub - simple and easy
Simply using a thinner snap ring will allow a third sprocket to be fitted to the stock hub!
Stock snap ring is 2.2mm and the replacement needs to be 1.5mm.
This allows you to then use a combination of sprockets such as 12-14-17 making a 2 speed ratio a lot more usable!
You can simply use a friction shifter or other shifters may work depending on the set up. It is common to need to modify the cable run, with an inner cable going straight through the spring of the anchorage and fastened with a barrel nut / grub screw.
- On a Ti triangle you are limited in sprocket size to 18t without modification.
Hubsmith hub - 11t capability!
Using a Hubsmith rear hub, you can replace the free hub body to one that accepts a locking, such as on traditional cassettes, rather than a snap ring.
This allows you to fit an 11t Shimano style cog, meaning you can widen that gearing range!
http://www.brommieplus.com/portal_c1_cnt_page.php?owner_num=c1_343119&button_num=c1&folder_id=44131&cnt_id=708310&search_field=&search_word=&search_field2=&search_word2=&search_field3=&search_word3=&bool1=&bool2=&search_type=1&up_page=1
Converting a 6 speed to 9 speed
Simply convert the external cogs from 2 to 3 and change the shifter - see - "Converting a 2 speed to 3 speed - non IGH"
Suitable for BWR hubs, or BSR*/SRF3*/SRF5 hubs that have been converted to a dual sprocket driver.
* These hubs offer ratios of 0.75, 1.1 and 1.33, compared to the BWR which offers 0.638, 1.1 and 1.567.
I like the sound of this upgrade and would be interested in getting the parts to add an extra three gears to my six speed, where did you get the parts from?
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