Set up the suspension for your mountain bike

My MGT mountain bike really is a product of my frugality. (Some would say cheapness.) I bought it at a pawn shop on East Third Street. It had great promise in my eyes, even with the broken cables, rusted chain, and sheared bar-end grips. I was lucky that the bright yellow color didn't raise its price in the appraiser's mind, and that the selling price was only twenty-five bucks.

I took the MGT in to my buddy Brian at Links & Kinks, and he refurbed it for the cost of a thorough tune-up. I was on the trail after spending less than $150.

That was a couple years ago. After buying another bike in Palm Springs and using it on the rocky hills there, I've become more discerning, more demanding of the performance on the trails. I'm still happy with the MGT, even though it's a small frame, so I don't intend to buy into the next level of performance. Instead, I've begun to pay attention to the suspension.

I noticed in one of my first rides this spring that the front forks really didn't have much movement. So I had Brian look at it, and he saw that the forks had seized. Where the forks should compress about 20% when I get on the bike, there was less than 5% change. On the trail, I could sense a bit of response in the forks, but not much.

So I asked Brian to replace the front fork and its suspension. Now the bike is so much more enjoyable. More responsive when I pull up to hop a log. Less of a jolt when the front wheel sets back down after a jump or hop. And more sensitive to my need to change direction as I pass through two shoulder-width trees and need to avoid a third tree that encroaches the path.

Now I’m no expert at the workings of front and rear suspension systems, but I do know that the suspension has to be set up for your weight and riding style. The right setting can make you faster, the bike more controlable, and the ride more enjoyable.

• Check the air pressure in your fork each season. The manufacturer usually recommends air pressure for your weight, and you should check it annually. Either the shocks will lose some seal contact or your  weight may be different.
• Each time you ride, check the amount of displacement as you mount the bike. Both the front shocks and rear suspension should drop about 20% of the available movement. 

So what does the setup do for your ride? Less drop means a stiffer setup, more drop a more cushioned ride.

• A stiffer setup loses the full travel of your suspension, and the bike bounces more through rocky terrain instead of smoothly tracking through. You may loose traction in corners, too. 
• Too much cushioning can allow the suspension to bottom out on bigger hits, and you may feel like you’re riding a sofa with worn springs.

But remember that your tire type and the tire pressure contribute to control and responsiveness. The choice of tire type is a long discussion, but the depth of tread, tire width, and flexibility should be appropriate to your usual trail. You can experiment with changes in air pressure on a couple rides. Raise the air pressure to slow the rebound, lower it to increase rebound. Make air pressure changes of about 5psi, which should result in a big difference.

Thanks to

Chris Carmichael Systems

for many ideas in this post.

Short MoMBA ride

Sunday, 12 February 2012

This is the week to start commuting by bike for another year. The daylight is strong enough for leaving home by 7:20, even on cloudy days, and for returning home by 6:30 in the evening. So there's plenty of time to put in eight hours of work. ...Now if Kodak doesn't lay me off as part of its stated aim of reducing the workforce by 16%, I can be cycling as much as 125 miles per week just in a daily commute.

Today, Sunday, was extremely cold, in comparison to the Winter we've had in Dayton so far. The bikeways were covered with a light snow that had fallen yesterday. But an alternative, the MetroParks Mountain Biking Area was open, according the the daily update on their phone line (937-277-4374).

I took Howard, my 11-year-old yellow Labrador with me, and he alternately followed and led me on the Twisted trail and the Mr. Zig-Zag trail. For the early half of the ride, trails were frozen pretty solidly, but by 11:45, the trail segments that received direct sunlight had thawed and the mud built up. So I decided to follow only two of the trails. The decision was good for another reason too, because Howard's stamina started to fail with only a half trail left to cover. He'll sleep well tonight.

Ride conditions
Temperature: 21 to 25°F at 12:00 noon
Precipitation: none currently, but about an inch of snow still covering the ground
Winds: 11 to 15 mph from the north and west
Clothing: Skinsuit, longsleeve undershirt, quilted tights, Goretex light jacket, ankle socks, quilted gloves
Bike: Lotus Legend fixed gear
Time: 00:32:45 for 2.69 miles
Heart rate: 142 bpm HRave, 164 bpm HRmax
Bikeway users: 3 cyclists, 1 dog
Playback of the ride

Bike-commute day 29—to gym and home

Hawthorn Hill to Runnymeade

Last Thursday evening, as a prelude to the Miami Valley Cycling Summit, I saw a screening of the documentary Veer at the Neon Movies.The movie takes us through cycling activities in three seasons in Portland, Oregon. Not only events like the ZooBomb [video parts 1, 2, 3] and performance groups like the Sprockettes, but also advocacy for safer cycling laws, managing a reclaimed bicycle exchange, and cycling education programs for kids in the 3rd through 6th grades.

Stoney Hollow

The Dayton area could use similar programs, which can raise awareness of cycling as a means of socializing, of entertainment, and of enhanced safety and access to alternative transportation.

In fact, we already have the beginnings of a reclaimed bicycle exchange at the Life Enrichment Center. This organization refurbishes bikes, paints them bright yellow, and places them for free use in the downtown area. As each yellow bike becomes disabled, a sticker on the bike has contact information for performing any needed repairs.

Walnut Hill to Wyoming

The Complete Streets Initiative is also being developed to reach the public schools with cycling information, as part of the Safe Routes to School program. As of 2009, the Dayton has used 20% of a $583,000 grant from the Ohio Department of Transportation to focus on five schools (Cleveland, Edison, Kiser, Ruskin, and Fairview). The funds built infrastructure for improved safety around the schools: lighting, high-visibility crosswalk striping and signage, bicycle racks, and sidewalk and curb repair. Some of the funds provide safety education and police overtime costs during back-to-school and high-traffic periods.

So, two of the directions have answers or plans in the works. I've been scouring Google Maps in the last few evenings, looking for the areas in the city that have a high point near a low point. The three map segments here are the first results. The red dot indicates the "mountain" and the blue dot the "depression." Over many years of cycling in the Dayton area, I've ridden the Stoney Hollow and Walnut Hill paths.

• The Stoney Hollow route drops 188 feet over 2.1 miles. I remember it as a shaded, cool area that has extremely limited auto use.
• The Walnut Hill route drops 177 feet over 1.0 miles. It would require road closure and police presence to allow any group ride.
• The Hawthorn Hill route drops 136 feet over 0.64 miles. It would also require police presence and street closures.

A performance group similar to the Sprockettes is a long way off. I've imagined that the Dayton version could be a mixed group of men and women, perhaps in gender-fuck costume on minibikes. But the biggest drawback is finding cyclists with a let's-have-fun-with-it mindset and bikes ready for rough use. Perhaps a choreographer would help the group with imaginative incorporation of the bikes with the dance moves. This direction seems pretty far removed from my abilities and interests. —Sorry to bow out at the very beginning.

Ride conditions
Temperature: 76 to 79°F at 17:20
Precipitation: none
Winds: 5 mph from the southwest
Clothing: Skinsuit; ankle socks. Open-finger gloves.
Bike: Trek 850
Time: 01:02:56 for 15.51 miles
Heart rate: 125 bpm average, 140 bpm maximum
Bikeway users: 16 cyclists, 16 pedestrians, 4 dogs
Here is a playback of the ride. 13th Garmin day.