I need a multi-tool/saddlebag sized 7mm Allen key

Retro road bikes are lovely but older standard bolts are a pain in the bum.

Saddle clamp is a 7mm Allen key – finally tracked down a long handled version in a set at Halfords for the garage, but my Google Fu is weak in finding one on a multi tool or a single one small enough to pop in a saddle bag.

Anyone got a suggestion where to find one online?

Plenty online, e.g. https://www.cutwel.co.uk/general-tools/screwdrivers-allen-keys-bits/allen-keys-torx-tools/7mm-long-reach-hexagon-allen-keys-atorn-52116570 Obv look for cheap P&P or a local engineering supplier

Cut it down, angle grinder will be quickest

Cut it in half to make it shorter. Or just strap it to the underside of the saddle if it’s only ever needed on that bike.

Or just buy a new bolt from ebay. Probably cheaper option.

The only thing I’ve ever seen 7 mm hex on is car brake calipers. That’s why they tend to be long arm hex keys. Are you sure it’s not imperial?

As it’s an old bike, is it actually a 9/32″? You might have more success looking for one of those.

B&Q sell cheap sets of short handled Allen keys, the B&Q local to me used to offer imperial and metric sizes too.

As it’s an old bike, is it actually a 9/32″? You might have more success looking for one of those.

That’s what I’d assumed but the guy who restored it and an LBS both confirmed 7mm was correct

mm hex key sizes have been in use on decent bikes since the late 70s; yep, I’m that old. Other stuff on the same bike will be imperial, e.g. bearings and wheelnuts

Use a 3mm and a 4mm together?

Alternatively get something like this ( https://www.ebay.co.uk/itm/364707046639?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=9RtuYQ4-SxO&sssrc=4429486&ssuid=kQvGtg5dTuC&var=&widget_ver=artemis&media=COPY ) and swap it with the T25 bit in a Topeak ratchet tool or something.

I’ve a SKS multitool with 7mm on it.

Perfect for rear ehub.

Less so for getting leverage on a saddle bolt though. I would still want a longer tool.

Have you considered instead of spending £10-20 on a tool you buy a different seat post?