D.I.Y. – Bottom Bracket Sleeve Modification

Warning: Bike Geek Post! Most cyclists have a certain bike part they tend to destroy. OK, some, like Scott Pauker, seem to destroy most everything, but for me it’s bottom brackets. This post isn’t meant to start a which BB is better debate, we’re all at the mercy of the manufacturers and their latest “standards”. For touring I’ve settled on the external bearing standard, because it’s currently the most widely used and easiest to replace. Also, unlike square taper bottom brackets, one size fits most, with the right adapters.

Continue reading D.I.Y. – Bottom Bracket Sleeve Modification

1985 Schwinn Cimarron Touring Bike Build Part 2

The Schwinn Cimarron touring bike build continues. As I mentioned in part one of this build, Jeff is converting this Cimarron mountain bike to a drop bar touring bike.

Setting up the brakes

The original cantilever brakes are staying, but have been improved with Velo Orange cartridge brake shoes. The original wheelset, while in great condition, was replaced with Shimano Deore M525 hubs laced to Sun Rhino Lite rims and the tires are 26×1.75 Continental Touring Plus Reflex.

Headtube Badge

The frame has been polished up and looks great for a 28 year old bike.

Vintage Crankset

The bottom bracket has been repacked and the original crankset has been cleaned up. The gearing is 28-38-48 in front with an Sram PG 850 11-32 8 speed cassette in back.


The shifters are Shimano 8 speed Ultegra bar end run in friction mode and the cables are VO Metallic Braid. The pull ratio of the Deer Head Superplate rear derailleur does not match the Ultegra shifters, but the friction shifting is spot on with the Powerglide II cassette. Teflon cable housing lining is used to guide the cables under the bottom bracket shell and reduce friction.

Ready to roll

The cables are adjusted, the bars are wrapped and it is ready to ride. Now it is ready for fenders, cages and racks.

1985 Schwinn Cimarron Touring Bike Build Part 1

Oh the beauty of vintage bicycles. Jeff has a couple of Schwinn Cimarron mountain bikes, one of which he’s had since new, that he is looking to fix up. The Cimarron that is the subject of this build is is a Craigslist $100 find that’s being converted from a classic mountain bike to a still classic drop bar touring bike.

The Begining

It is 100% original, with the exception of the tires and the frame is lugged 4130 chromoly steel with a fillet brazed head tube.

Fillet Brazing

Jeff is converting this to 8 speed indexed shifting and swapping some parts for fit and reliability, but keeping the classic Shimano Deer Head derailleurs.

Deerhead RearDeerhead Front

Some of the parts that are being swapped off this bike are going to be used on the other Cimarron build still to come and the parts that are being reused are getting overhauled and cleaned.

Back Work

The stem that is going on is a Nitto Dirt Drop, the handlebar is a Velo Orange Grand Cru Chris’s Rando Handlebar, brake levers are Cane Creek SCR-5 and the cables are VO Metallic Braid.

Front Work

Lots of work still to come.