M7x1 bolts for 3ttt seat post

Got some irregular size bolts today.
10 pcs M7x1 30mm and 10 pcs M7x1 40mm.
I ordered some 25 mm bolts, but apparently these were not on stock and thus replaced by the 30 mm ones.

The hex heads of the original bolts of my 1980s 3ttt seat post are almost round and the 11 mm open end wrench slips.

Tip for people with the same kind of problem / also looking for M7 bolts: it's a common size on Citroën 2CV cars. There are lots of small webshops for 2CV parts. At least in The Netherlands and Germany, for sure in France, too.
I ordered mine here, 20 bolts for 10 euro incl P&P.
Ordered yesterday, received today.

Adidas Systeme 3 pedals, shoes STi

A very rare set of racing pedals. Technically and commercially a disaster, so these pedals disappeared from the market very quickly.
First, only 1 set of shoes fit these pedals and vice versa. No compatibility at all.
Next to that, there is no safety release function like "Look" clipless pedals (and clones) have.
The pedals have small levers, which have to be operated by hand.

The system works similar to Cinelli M71, but it has a different lock and release system. Besides that, there are no cleats to be mounted under the shoes, but the proprietary shoes have grooves at both sides of the soles and some kind of square hole in the centre.
The shoes slide into the "rails" at the sides of the pedals. A spring loaded cam in each pedal finds its way into the square hole and locks the shoe.

The pedals can be set into 3 different positions by moving the small lever in the (1) backward position, (2) middle position or (3) upward position.
Position 1 (lever backward) lets you slide the shoes into and out off the pedals. The cam is completely sunken into the pedal surface and doesn't lock the shoe. So, nice for doing a small ride, e.g. from the dressing room towards the start.
Position 3 (lever upward) is the "race" mode. The cams protrude from the pedal surfaces, but can be pushed back in. So, you can slide the shoes into the pedals and your feet are really locked. Even when you crash, you pedals (as well as the rest of the bike) remain attached to your feet. Not good for you ankles and other body parts.
By moving the levers into the backward position, you can take your feet from the pedals safely.
Position 2 is an intermediate position. It's very tight, but if you twist you feet (with high force), you may be able to click out off the pedals. I did a few in-house tests. I managed to release my feet, but I needed serious force. I will try to find out how that works under race conditions.

Since no cleats have to be attached to the soles of the shoes, there must be another adjustment system. The upper platforms of the pedals have been attached to the pedals bodies with 3 screws on each pedal. So, instead of adjusting the cleats, the angle and forward/backward positions of the pedal platforms can be adjusted.

Successor of this shoe and pedals system, but no success either: Podio.
These pedals from the same inventor (Mr. Lilian Christol) as the Adidas Systeme 3 pedals work with cleats that basically can be mounted to each pair of racing shoes, but the unique bolt pattern prevents that.

Dura Ace track chain ring 50T

I'm getting weaker. I need this chain ring, because 52x16 is getting too large for a relaxed evening on the track.
Larger sprockets are rare, so the only option is to switch to smaller chain rings.
50 x 17 must be enough for the near future.
Bargain from "Marktplaats", so I couldn't let it go.

Rossin Pista 50 cm

Perhaps you felt this coming up. Yes, there's going to be a Rossin Pista project. Or better, the project runs for a long time already, but just now it's clear, which bike brand it's going to be.
Earlier blogs mentioned that I made good progress. But I've been looking for a proper frame set for a long time and about 2 weeks ago I found this.
The guy who sold it reacted positively on my interest and we came to a deal. Andrea, the seller, seems to be a very nice chap from Milano, Italy. He wrapped the frame, fork, Rossin pantographed Cinelli stem, OMAS head set, Gipiemme bottom bracket set and Rossin bar plugs very well and last Thursday the parcel finally arrived.
It's a red Rossin track frame, centre to top 50 cm, with a top tube of 51 cm centre to centre. The paint on frame and fork has several damages and scratches, but not unusual for an Italian frame of approx. 30 years old, well used on velodromes.
Maybe I'm just going to clean it and polish the paint with "Commandant", but if I'm not satisfied and if I can find a good painted, I may consider to do some "spot repair" to restore the paint work. In the end, it has to become a beautiful track bike.
About the frame size: no I'm not able to ride it. But small bikes look so pretty and I have plenty bikes to choose from when I'm going to ride. Maybe one of our kids can ride this Rossin within a couple of years. Would be great.