Britbike forum

Classic British SparesKlempf British PartsBaxter CycleBritBike Sponsor SteadfastCyclesThe Bonneville ShopLowbrow CustomsGirling Classic MotorcycleLucas Classic MotorcycleHepolite PistonsIndustrial tec supply

Upgrade Your membership! Premium Membership Gold Membership Vendor Membership

New Sponsor post
2023 Classic Triumph Motorcycle Calendars
by C.B.S - 09/22/22 5:28 pm
New FAQ post
Member Spotlight
Dave Comeau
Dave Comeau
Hamilton, Mass. USA
Posts: 1,747
Joined: August 2001
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Top Posters(30 Days)
kevin 115
DavidP 60
Top Likes Received (30 Days)
kevin 30
reverb 29
Newest Members
Pacho, Abtinnmant150, Fritzer_108, Ratty, paul cheswick
12,261 Registered Users
Who's Online Now
7 members (crabby15, pidjones, Gordon Gray, Andy Higham, mr.moto, Opo, TR7RVMan), 18 guests, and 23 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums35
Topics76,325
Posts777,860
Members12,261
Most Online204
Jul 10th, 2022
Previous Thread
Next Thread
Print Thread
#891478 09/22/22 10:45 am
Joined: Aug 2022
Posts: 114
Likes: 17
P
Britbike forum member
OP Offline
Britbike forum member
P
Joined: Aug 2022
Posts: 114
Likes: 17
I want to install a set of sidecar rated fork springs in my Golden Flash forks, but I'm confused. This is a description of some heavy duty sidecar springs advertised on Ebay....

"BSA A10 A50 A65 fork springs.

Heavy duty for use with sidecars

External type.

OEM part number 42-5145.

Newly manufactured in England . Excellent quality.

Approx 11 3/4" long, 1 7/8" outside diameter, 1 7/16" inside diameter.

Sold in pairs."


What are External type fork springs ? If there are external type springs, then it stands to reason that there must also be internal type springs.

Which type do I need for my bike ?

Thanks


I identify as being fully vaccinated.
BSA on eBay
Joined: Oct 2006
Posts: 4,775
Likes: 185
I
Britbike forum member
Offline
Britbike forum member
I
Joined: Oct 2006
Posts: 4,775
Likes: 185
"External" fork springs go around the OUTSIDE of the fork stanchions. Typical of BSA forks.

"Internal" fork springs go INSIDE the fork stanchions, as typical of Triumph forks, 1945-1963.

2 members like this: kommando, Gordon Gray
Joined: Dec 2004
Posts: 11,659
Likes: 262
Britbike forum member
Offline
Britbike forum member
Joined: Dec 2004
Posts: 11,659
Likes: 262
You want external springs, the Draganfly website has the spring details for the BSA heavy duty forks fitted to A10 through to A65.

Joined: Aug 2022
Posts: 114
Likes: 17
P
Britbike forum member
OP Offline
Britbike forum member
P
Joined: Aug 2022
Posts: 114
Likes: 17
Thanks. I will order external ones. smile


I identify as being fully vaccinated.
Joined: Feb 2008
Posts: 6,135
Likes: 526
Britbike forum member
Offline
Britbike forum member
Joined: Feb 2008
Posts: 6,135
Likes: 526
For sidecar use it was normal to lower the gearing by using an 18T engine sprocket compared with the standard 21T sprocket for the A190.
The 18T sprocket used to be readily available as it was the standard engine sprocket for the A7 500 cc bike.
HTH

Joined: Aug 2022
Posts: 114
Likes: 17
P
Britbike forum member
OP Offline
Britbike forum member
P
Joined: Aug 2022
Posts: 114
Likes: 17
Originally Posted by Tridentman
For sidecar use it was normal to lower the gearing by using an 18T engine sprocket compared with the standard 21T sprocket for the A190.
The 18T sprocket used to be readily available as it was the standard engine sprocket for the A7 500 cc bike.
HTH


I'm not sure what sprocket I have in it now, I will see how it performs.

I do have a spare 20 tooth sprocket.


I identify as being fully vaccinated.
Joined: Jun 2019
Posts: 163
Likes: 13
M
Britbike forum member
Offline
Britbike forum member
M
Joined: Jun 2019
Posts: 163
Likes: 13
Originally Posted by Pureblood
Originally Posted by Tridentman
For sidecar use it was normal to lower the gearing by using an 18T engine sprocket compared with the standard 21T sprocket for the A190.
The 18T sprocket used to be readily available as it was the standard engine sprocket for the A7 500 cc bike.
HTH


I'm not sure what sprocket I have in it now, I will see how it performs.

I do have a spare 20 tooth sprocket.

The real question here is: are you gonna use them (springs and therefore the bike) with or without sidecar?


Harold / Motolab.nl
BSA: W35-11 (sloper) ‘35, WM20 '40 M21,B31 '54 B33 '55 ZB34GS '49, DBD34GS '58, DBD34GS ‘60
Triumph 5T '49 + T100 + speedkit
Moto Guzzi LeMans '79
BMW R51/3 '51, R100GS '89
Joined: Aug 2022
Posts: 114
Likes: 17
P
Britbike forum member
OP Offline
Britbike forum member
P
Joined: Aug 2022
Posts: 114
Likes: 17
Originally Posted by Motolab
Originally Posted by Pureblood
Originally Posted by Tridentman
For sidecar use it was normal to lower the gearing by using an 18T engine sprocket compared with the standard 21T sprocket for the A190.
The 18T sprocket used to be readily available as it was the standard engine sprocket for the A7 500 cc bike.
HTH


I'm not sure what sprocket I have in it now, I will see how it performs.

I do have a spare 20 tooth sprocket.

The real question here is: are you gonna use them (springs and therefore the bike) with or without sidecar?


With.


I identify as being fully vaccinated.
Joined: Aug 2022
Posts: 114
Likes: 17
P
Britbike forum member
OP Offline
Britbike forum member
P
Joined: Aug 2022
Posts: 114
Likes: 17
Originally Posted by kommando
You want external springs, the Draganfly website has the spring details for the BSA heavy duty forks fitted to A10 through to A65.

They have the details but not the springs.


I identify as being fully vaccinated.
Joined: Jan 2014
Posts: 2,260
Likes: 410
N
Britbike forum member
Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 2,260
Likes: 410

Joined: Aug 2022
Posts: 114
Likes: 17
P
Britbike forum member
OP Offline
Britbike forum member
P
Joined: Aug 2022
Posts: 114
Likes: 17
Thanks NickL


I identify as being fully vaccinated.

Moderated by  Allan G, Jon W. Whitley 

Link Copied to Clipboard
British Cycle SupplyMorries PlaceKlempf British PartsBSA Unit SinglesPodtronicVintage MagazineBritBike SponsorBritish Tools & FastenersBritBike Sponsor






© 1996-2022 britbike.com
Powered by UBB.threads™ PHP Forum Software 7.7.5