Junkyard Dawg - Version 4.0 Junkyard Dawg - Version 4.0
Mark and Matt Stonich's MWB Junkyard Dawg has been sort of a Swiss Army Bike. Now in it's 4th iteration, it's been a real test bed.



V:1.0 Built in 1995 as racing bike, with a 451 front wheel and much crank/tire overlap, so not too safe on the street. Mid drive gave a gear step-up for racing. Matt Stonich used it to win something like 16 out of 22 races in '95. Back in "95 this was one of the lowest bikes in the races. BTW, "Stock" means "Unstreamlined" in HPRa racing.

Adjustable BB was a design flaw. While leading a race, Matt crashed lapping an inattentive back-marker. He got right back up and quickly caught the new leader. Taking it easy, while waiting for a good passing spot, he backpedaled going into a corner. The crash had twisted his cranks just enough that backpedaling caused the chain to derail. Frustrated, he threw the bike about 30 feet. The next issue of Mountain Bike had this advice "Do not throw your bicycle, it shows poor breeding".



V:2.0 For Ice Racing, Mark made a trailing link suspension fork with a hockey skate blade. This lowered the cranks, and eliminated crank/wheel interference. Suspension medium is two 1965 Plymouth Barracuda valve springs. Never took any 1st places, but got several top 5 finishes. Sheet metal screws through frame and sliding boom locked BB in place.



V:3.0 After building Matt a new race bike, Mark turned Dawg into a street bike for himself, by raising the seat 6" on aluminum plate risers, adding fenders, a stem with adjustable tiller, and bars that turned out to be the forerunner of the Calhoun Cycles EvoBars. Replacing the fork with a longer one, (a road fork shortened by an inch), shorter cranks, and putting on a 349 (16") wheel eliminated the crank/tire interference.

Handled pretty good, but head angle was designed for a lower, more reclined seat, so reach and tiller were a little less than optimum. Wheelbase is 52" yet the overall length is shorter than many SWBs. The weight distribution (1/3 F. - 2/3 R.) is similar to a good LWB so it's stability is similar to that of a much larger bike. For Mark, mid-drive was used to lower the gearing. Connecting chain coming off was problem until he added a wrap-up device just ahead of the mid-drive.


V:4.0 Mark cleaned it up and painted it for a birthday present for Matt. Set up as a rather fast commuter. Mid drive gearing is now almost 1 to 1 so mid-drive will probably be replaced by an idler. Seat is now nearly as low as when Matt raced it. BB now brazed solidly in place.

Jeff Caswell looked at the front of the bike and proclaimed that the BB shell was crooked. Actually it is not*, but the head tube is not centered on the main tube, creating an optical illusion. Dawg was built in a weekend, and Matt was in such a hurry that he bored the head tube hole in the main tube without checking to see if it was centered. It's visibly off center, but apparently has no effect on handling.

* At least not that I can measure using a surface plate and dial calipers.


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