My 1988 Specialized Sirrus
Part Diary, Part Technical Manual, Part Tips & Tricks

After riding the bike around for a couple years as a fixie, I decided to convert the bike back to its original geared configuration. I now keep this bike at my parent's house in Southern California, so I always have a bike to ride when I visit. Somehow this seems very appropriate, the first bike that my parents bought for me, resides at their house.

4/27/2013 - I brought the Klein Mantra to LA and brought the Sirrus back, so I can clean it up a bit and put some miles on it around here. I'll be looking for some standard NITTO drop bars and a period correct saddle.

5/17/2013 - I installed a slightly longer stem, new NITTO B105 bars, a Cinelli saddle, new brake cables/housing, and bar wrap; now it's starting to look like how it was when I first got it. Cleaned and lubed the chain, adjusted the brakes and derailers - ready to ride.

5/23/2013 - I went out for a ride last weekend and the cockpit felt very cramped and my lower back ended up getting quite sore. I don't understand why the bike felt so uncomfortable now, since I rode this bike for so many years through all kinds of roads without any complaints - I must be getting old. Today I installed a new seatpost with a 3 cm setback, hopefully this makes the bike a better fit.

3/13/2014 - The increased seatpost setback definitely makes the bike fit me better. I took it out for a quick spin today. I noticed on every pedal revolution, there was a slight clunk on the drive side of the bike. Since it happens at the same spot every revolution, regardless of gear, I suspect it is the bottom bracket. I swapped pedals just to make sure it wasn't the pedals, it wasn't. So next time I open up the bottom bracket, I'll see if it just needs new bearings or if the spindle is worn. In the meantime, I'm going to store the bike at a nearby warehouse.

Frame: 1988 Specialized Sirrus, 54cm. Double butted Cro-moly with 126mm spacing. Original red paint with a yellow "S" at the top of the seat stays. Serial Number: GC355512-C68H10.
Fork: 1988 Specialized Sirrus 1" threaded. Cro-moly with 100mm spacing. Original red paint with a yellow "S" on the crown.
Front Wheel: Matrix Titan rim with Matrix sealed bearing hub, the original front Wolber GTX was stolen during college.
Rear Wheel: Wolber GTX wheels with Shimano 105 FH-1050 hub.
Cranks: Shimano 105 FC-1050, 170mm, 130mm BCD.
Chainrings: Shimano SG B-53 and Sugino 42. During the mid 90s, I was told that Biopace chainrings would hurt your knees, so I replaced them with round chainring. Funny how Rotor eliptical chainrings are now cutting edge technology again.
Cassette: Shimano 105, 6spd, 13-23T
Bottom Bracket: Specialized 113mm spindle, standard 1.370"l x 24TPI English thread.
Front Derailer: Shimano 105 FD-1050.
Rear Derailer: Shimano 105 RD-1050.
Shifters: Shimano 105 SL-1050.
Headset: Tange Sekai, 1" threaded, chrome.
Chain: Shimano Uniglide (UG).
Stem: NITTO forged aluminum, 100mm reach, 25.4mm clamp.
Handlebar: NITTO B105 Classic, 25.4mm diameter, 40cm wide.
Brakes: Shimano 105 BR-1050.
Levers: Shimano 105.
Pedal: Shimano PD-M520 SPD, black.
Seatpost: Kalloy Uno 2014 aluminum, 27.0mm diameter, 350mm length, 3.0cm setback, black.
Saddle: Cinelli Unicanitor, white.

The bike currently weighs 23 lbs 4 oz as shown.

The following are OE parts that I am currently not using:

Chainrings: Shimano Biopace 53T, don't remember what I did with the 42T.
Stem: Specialized (by NITTO) forged aluminum, 90mm reach.
Handlebar: ITM Tema Racing Sport, 25.4mm diameter, 38mm wide. I flipped and chopped these original bars when I converted the bike into a fixie. These are steel handlebars and weigh a ton, but I'm sure they are strong.
Seatpost: Strong aluminum, 27.0mm diameter. 1.5cm setback. Wedge nut got stripped.