SB6560 arrived in terrible condition with missing gear lever bosses and poorly applied transfers. It is a frame that has always been overlooked and put on the back burner while other projects came in and took over. Underneath the skin however, it is a lovely 531c SBDU Services des Courses frame that now deserves to hit the top of the project pile!

What do you call it? Do you say Rear Derailleur, Rear Mech, Rear Mechanism, ‘Mech’ or just ‘Gears’… they are all names to describe the mechanism typically controlled by a spring and cable that derails the chain and moves that chain out of one gear and into the next. I’m sure everyone has their favourite model and I am no exception; I’ve never tried to hide my love of Shimano, so my all time favourite rear derailleur has to be the Shimano Dura-Ace 7400. Even though it has a simple job to fulfill, the introduction and continued innovation of the rear derailleur has always been at the forefront of bicycle technology and the RD-7400 was in my opinion the start of the modern technology revolution.

This isn’t intended to be an Internet resource of Raleigh frame numbers! If you are reading this for anything other than SB number sequences from the SBDU then please make sure you corroborate my information with other resources.

This blog post covers a basic background of things I’ve learnt about Raleigh frame numbering systems during my own research over the last few years, from the introduction of ‘W’ numbers at TI-Raleigh’s Worksop Carlton factory in late 1973, extending through to the late 1990s and Raleigh’s Special Products Division. The only numbers I’m confident about are the Specialist Bicycle Development Unit (SBDU) SB frame numbers at Ilkeston. Some of this blog post, especially the late 80s / early 90s is what I will call ‘work in progress – thinking out loud – still formulating things in my head‘ type of work, there just aren’t enough bikes available at the moment to provide more accurate detail.

Emails dropping into my Inbox on a lazy Saturday afternoon are quickly becoming the best kind of email! The one I received last Saturday offered a mint condition frame together with it’s original Raleigh box and some documentation! Now that is an offer that needs serious consideration. The images came through a couple of days later and they displayed a frame that was every bit as described… built up but probably never ridden, maybe the closest I’ll ever get to a New SBDU frame.

Time Trial frame? Road frame? Or a bit of both? What exactly is it?

SB7393 came with a story that it was built and used for time trials and ridden by a junior. I was also told by Rob, the previous owner, that it was a “lively” ride! It looks like a conventional SBDU road bike, but then again, SB time trial frames can look like conventional road bikes too; and with vertical and horizontal ends as options on both types, it is ultimately down to geometry to unravel the puzzle.

I’m gradually working my way through the snagging list on SB4059, all those little jobs that I know about and that require attention are slowly getting done. Not so long ago I swapped the original Campagnolo grey outer brake cables for original Campagnolo black alternatives, and I also updated some of the frame transfers so that SB4059 correctly reflected the 1980 TI-Raleigh scheme. This time I’m repairing the threaded seat lug so that I can fit a correct and original SBDU threaded bolt.

It has been a long couple of days but I’ve finally completed this small and difficult project to bring SB4059 up to spec in terms of a 1980 period SBDU TI-Raleigh transfer scheme. Deciding to go for it and wreck the paint on a perfectly good frame meant that there was no going back. Thankfully my patience and care have paid off and SB4059 is done!

Following on from my previous blog posts about SBDU fork ends and seat stay caps, here is another short post in a series I’m writing about individual areas of SBDU frame design. This time I’ve chosen to write about gear levers, or more precisely, where they are positioned on the downtube. I’m quite sure that many people have never even considered this, after all, they are just levers mounted on a tube. And let’s face it, who actually does think about the small stuff like this… apart from me!