FreeSpoke; Surly Marge Lite to Shimano FH-M475, for Pugsley

4068WP

Edit: Spoke hole offset is +/- 12.5mm on Surly Marge Lite rims.

The rim and tires came in the mail from Surly and the hub was sourced from The Garage in Helena, MT; the spokes were cut at the Summit Bike Shop in Bozeman and a truing stand was arranged via Craigslist.  FreeSpoke provides the spoke length calculation and the graphic assurance that I have put all my pluses and minuses in the right place.

Rim: Surly Marge Lite

ERD: 543.5mm

Spoke bed offset: -6mm, +6mm

Hub: Shimano FH-M475

Center-to-flange: L 33.5mm, R 20.5mm

Flange circle diameter: 61mm, both sides

Spoke hole diameter: 2.5mm

Hub offset: 17.5mm

Spokes: 32

Lacing pattern: 3 cross

Left Right
Spoke length 261.3mm 262.3mm
Bracing angle 4.8°
Tension distribution 100% 69%
Spoke head clearance 2.61 mm 2.61 mm

FreeSpoke is my preferred spoke calculator.  The graphic description helps ensure you’ve input all the proper dimensions, especially when offset hubs and rims are involved such as with the Pugsley.  The above calculation is for a Surly Marge Lite rim built to a Shimano FH-M475 rear hub, for Surly Pugsley.  The dimensions of the Deore and XT high-flange models appear to be the same as the M475.

For this build I used 262mm spokes all around.  Some Rock-n-Roll Nipple Cream was applied to the threads, while the spoke holes and nipples were generously greased to prevent corrosion in use and to reduce friction during tensioning.  This is the first time I’ve used a commercial spoke prep. Linseed oil is messy, and does too little to minimize friction and wind-up during tensioning in my experience.  The Rock-N-Roll prep is less messy than linseed oil and was easier to work with during the build.  I’ve had success building wheels with standard bearing grease, and wouldn’t hesitate to do it again.  With proper spoke tension, I’ve never had any spokes loosen in use.

In a day, I sourced all the necessary parts, laced the spokes, tensioned and dished the wheel, and installed a new pair of lightweight Surly Larry 120tpi tires.  In a day, the metamorphosis is complete– my wheels are lighter, yet more voluminous than they were yesterday.

4047WP

4051WP

4061WP

4055WP

4069WP

4082WP

4113WP

4096WP

4140WP

4139WP

4142WP

My rear Schwalbe Big Apple developed a slow leak in the last two days of use, and a shred of steel was found when the tire change took place.  Technically, I managed to ride from Anchorage, AK to Bozeman, MT without a flat, a distance of over 3200 miles.  To dish the new wheel properly, I installed it in the frame several times and used my fingers to estimate the distance from the chain stays.  About 2000 miles since Whitehorse, my second chain on this cassette is worn.  The time has come to return to 8 speed equipment, easier shifting and cheaper parts.  Check the manufacture date on the Marge Lite rim– it’s Cinqo de Mayo.

Image, calculated figures and format courtesy of FreeSpoke.

Need use of truing stand…

3794WP

My Surly Marge Lite rim and ultralight Larry tires have arrived in Bozeman, according to the recipient.  That part was easy.  Tracking down a rear 32h disc hub, of any kind, is a lot more complicated.  Bozeman has a half-dozen bike (and ski) shops, and none of them definitively have what I’m looking for.  I’d expected this hub to be easy to find, even common, as it’s the bread and butter of the mountain bike world.  One shop has two used Deore hubs with “loose axles”, which means I may or may not have a serviceable hub once the bearings are adjusted.  I’ve found a shop with a spoke cutter, so that part is solved.  Finally, I’m hoping to track down a truing stand for the finish work.  I can lace the wheel in the park while sipping a cold beverage, but I’d like to bring this thing into the world in front of a proper truing stand considering what I’ve got planned for it.  And as a small detail, the Surly 35mm axle spacer would be helpful for dialing in the dish of the wheel, but it’s not absolutely necessary.

These things are complicated while traveling, and ironically the weird snow bike with the offset frame and wheels has nothing to do with it.  The most common part, a 32h hub, is the hardest to find.  I’d hoped to spend my money locally and I’ve come across this problem before, but this is what happens sometimes when you rely on the LBS.  I don’t want to hear “we can order it”.  What’s the point of a physical shop that doesn’t stock bicycle parts?  There is a strong argument for the sale of bicycle parts on the internet to able home mechanics.

Note: All the bike shops claim to sell “wheels”, but none stock hubs.

I’ve called a lot of shops today, but from my experience this is what you do sometimes:

Need use of truing stand… – $1 (Bozeman)


Date: 2012-07-27, 6:41PM MDT
Reply to: xnkkt-3167619481@sale.craigslist.org [Errors when replying to ads?]


I’m touring through town and am building a wheel this weekend. I’ve got everything figured out, except the use of a truing stand for the finish work on Sat or Sun. Any help is appreciated. I’m offering a donation of some kind.
The long story:
I’ve ridden from Anchorage, AK on a Surly Pugsley that was my transportation through the winter. Thus far I’ve mostly been riding paved and dirt roads and have used a medium-volume Schwalbe Big Apple tire. I’m passing through Bozeman this weekend and will be putting the big fat tires back on the bike as the rest of the summer will be on dirt roads and trails through WY, CO, UT and AZ. I’m also building a new rear wheel with a Surly Marge Lite rim, which is over a pound lighter than the current Large Marge and should add to the fun. As such, I need use of a truing stand for about an hour on Sat PM or anytime on Sunday. Anyone have a personal stand they’d be willing to share for a donation of beer or cash or fresh food? I’m aware of the Bike Kitchen, but their hours are limited. Thanks.
nicholas
http://www.gypsybytrade.wordpress.com

  • Location: Bozeman
  • it’s NOT ok to contact this poster with services or other commercial interests

I’m in Helena, MT and will check with local bike shops in the morning for a new 32h disc hub.  Between the resources of ten shops in two cities and a persistent cyclist, a wheel will be built.  Full fat, coming soon!

The live CL ad is here, and my listing for a new or lightly used 32h hub is here.