The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: nimrod650 on 18.10. 2016 17:21

Title: 8in brake
Post by: nimrod650 on 18.10. 2016 17:21
hi i have a pair of forks for 7in front brake the boss has been removed for brake anchor can you obtain a spindle with smaller thread to fit 8in brake thanks
Title: Re: 8in brake
Post by: Rocket Racer on 20.10. 2016 09:07
Quote from: nimrod650 on 18.10. 2016 17:21
hi i have a pair of forks for 7in front brake the boss has been removed for brake anchor can you obtain a spindle with smaller thread to fit 8in brake thanks

Are you talking about replacing the Alloy 56/57 type hub or the iron 58 on iron 7" full width hubs with which 8" brake?
While only two were used on the A7/10 BSA had at least four 7" front brakes in the fifties and likewise several 8" front brakes (half and full width).
If you can clarify which year/type brakes/forks that might help  *dunno* as there are many variations if we include other BSA models
 
Title: Re: 8in brake
Post by: KiwiGF on 20.10. 2016 10:54
Is the 7 inch brake that is used with your forks? It does as you say use a boss on the brake plate to engage with a lug on the fork leg? It is used on plunger and rigid models (I think).

http://www.draganfly.co.uk/index.php/bsa/bsa/a710--b3133--c101112--m202133/category/915-3-front-wheel-7-a-b-m-group
Title: Re: 8in brake
Post by: nimrod650 on 22.10. 2016 19:17
Quote from: Rocket Racer on 20.10. 2016 09:07
Quote from: nimrod650 on 18.10. 2016 17:21
hi i have a pair of forks for 7in front brake the boss has been removed for brake anchor can you obtain a spindle with smaller thread to fit 8in brake thanks

Are you talking about replacing the Alloy 56/57 type hub or the iron 58 on iron 7" full width hubs with which 8" brake?
While only two were used on the A7/10 BSA had at least four 7" front brakes in the fifties and likewise several 8" front brakes (half and full width).
If you can clarify which year/type brakes/forks that might help  *dunno* as there are many variations if we include other BSA models
with the standard fork legs  for 8in s/side brake getting hard to find people are using the earlier ones but the spindle has a smaller thread than the 11/16ths
Title: Re: 8in brake
Post by: chaterlea25 on 22.10. 2016 22:26
Hi Nimrod,
Quote
with the standard fork legs  for 8in s/side brake getting hard to find people are using the earlier ones but the spindle has a smaller thread than the 11/16ths

The spindle for the 8in. single sided hub is a stepped item
A top hat shaped shouldered spacer is fitted through the RH bearing from the inside
The spindle step pushes the sleeve trough the bearing and brake plate and into the fork leg
The spindle thread is 9/16 x 20 Left hand and it threads into the right side  fork leg

John