Header

FRAME BRAZE-ON FITTINGS

With perhaps the exception of track bikes that by their very nature, are spartan, Scot's were fitted with a variety of additional braze-on's to accommodate particular types of gear, accessories or other components.

These can be used to assist dating of a frame, though only in a very broad sense, as it was not uncommon to have the originals removed and replaced with different type as the customers equipment changed and when the frames were refurbished or brought up to date.

To help identify what each particular braze-on was used for, these are examples of the more common ones.

BRAKE CABLE CLIP

clip position

Whilst many machines pre-1939 were not fitted with any 'fixed' means of securing the brake cable outer to the frame, This type of clip was used on some frames until about 1948 as a more permanent solution than a band-on steel cable clamp. Made of spring steel these were brazed to the underside of the top tube in three places, supporting the rear brake cable as it ran from front to back.

From 1948 Rattray's used cable stops to route the cable, and these clips were no longer required.

Clip In Place

GEAR CABLE GUIDES

Pulley Position

To solve the problem of bare inner cables running from gear levers to gear changing equipment, Rattray's often used small pulleys. In this particular case, a small bracket on which the pulley pivots, is brazed to the top of the bracket shell.

A single pulley here was generally for routing a cable to a derailleur type mechanism. Where equipped with front & rear derailleurs there are often two pulleys combined. This arrangement is often found on frames from the early 1950's that used Cyclo or Simplex type derailleurs.

Pulley In Place

The late 50's saw the pulley arrangement replaced by simpler but almost as effective pressed steel guide. These could be single channel and on the right-hand side, for routing a gear cable to the rear derailleur, or as seen here, with a second channel for passing the cable up to the front derailleur., provided it could be operated by a right-hand fed cable.

Cable Guide

GEAR CABLE STOP

Stop Positions

To allow bare-wire cable runs to the rear derailleur, a braze-on stop was added to the top of the right-hand chainstay. The bare cable running from the pulley or guide was fed in to a cable outer here, from where it ran to the derailleur. The same type of stop can occasionally be found on the left-hand side of the downtube at the bottom, to feed the cable up to a front derailleur.

Stop in Place

LAMP BRACKET BOSS

Boss Position

Fitted to many Scot's, this boss was used to bolt the almost "industry standard" lamp bracket to the front forks. Rattray's generally used brackets and bosses produced by Chater-Lea.

Generally these were brazed on the right-hand fork blade however some machines for export had them fitted to the left to suit the driving 'hand' of the country they were going to, for example on the left for Canada as shown on the adjacent image.

Boss FrontBoss Side

Boss in Place

MUDGUARD BRACKET

Mudguard Brkt postion

Until around 1947 Scot frames that were or could be fitted with mudguards, had these brackets brazed to the bottom of each seat stay, and at the rear of the fork legs.

With the change in style of frame ends (dropouts) came integral mudguard eyes and separate these brackets were no longer required nor fitted.

Mudguard Brkt in Place

PUMP (INFLATOR) PEG

Peg Positions

Pump Pegs can be found fitted on all the main tubes of the frame and popular locations were on top of the Down tube, underneath the Top Tube, and in front or behind the Seat Tube (at one time centrally placed on the tube, but generally offset to the right of the frame, to allow room for mudguards.

Peg in Place


Articles
Return to Frame Details Page

Home
Home

History
History

Models
Models

Gallery
Gallery

Identify
Identify

Articles
Articles

Links
Links

Contact
Contact

St.Andrews Cross

Copyright © 1999-2003 R.Reid Last Updated Thursday, 16-Oct-2003 17:28 hrs.