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Posts Tagged ‘AMTBC’

Autumn Bike Updates

Saturday, May 14th, 2011

If you recall, I swapped the 2.1″ Ignitors on the Eriksen with some rather heavy 2.35s. A few weeks ago I raced the Ignitors (with Eriksen attached) at the AMTBC MT. Torrens enduro. Overall, the 2.35″ Ignitors performed well. More specifically, the 2.35s were noticeably slower on the climbs (it wasn’t me, really), but more than made up for any shortcomings on the way back down.

The downhills at Mt. Torrens are a lot of fun with fast rocky sections, several ramps, berms and other potentially painful features. With my new monster-truck tyres I was able to catch other riders on the downhills and have a lot of fun doing it. So, the 2.35s are staying and I’ll just have to deal with the climbs.

Also of interest may be my new lights. The Mt. Torrens enduro was held in the afternoon with approximately three hours of daylight and three hours of night riding. Prior to this race I had been using a NiteRider MiNewt Mini USB, a 115 lumen light. For this race I used a new bar-mounted NiteRider TriNewt, which comes in at just under 500 lumens.

I ran the TriNewt in the reduced brightness mode for a reported seven-hour battery life during the night portion of the race. Prior to the race I hadn’t noticed much diffrence between the full and reduced brightness modes, and found the light in this mode more than adequate for the race.

I brought the MiNewt Mini USB as a backup light, but I never felt a need to use it. Since the race, I’ve purchased a helmet-mount kit for the MiNewt Mini USB. I haven’t had a chance to use it yet, but I’m curious to see if it is a worthwhile addition to the TriNewt.

If you’re interested I ended up finishing in the middle of the men’s solo class, even with an unscheduled coffee and photo break– full results over at AMTBC.

Prior to the Mt. Torrens enduro I converted the ’08 Reba Race from 100mm to 115mm. I wasn’t convinced this is what I wanted long term, but I wanted to give it a try. Well, after a few rides and the enduro I converted the Reba back to 100mm. Why? The fork went from fairly stiff and generally nice to noticeably flexy and generally frustrating.

During the conversion back to 100mm I replaced the fork oil (again) and the dirt/oil/foam seals on the fork lowers. Thanks again to BMCR for having the parts in stock. Anyway, replacing the seals is fairly easy, and the now that the fork is back to the “right” height everything feels a lot better. In any case, my rebuild proved a lot cheaper than some others I’ve recently heard about.

Want more? I’ve been getting the Gunnar in shape for the next cyclocross race and had the bottom bracket faced, thanks to Brian at Road Rage Cycles. This may seem like an odd thing to do to a 10-year-old frame, but I noticed my external-bottom-bracketed FSA cyclocross crankset didn’t spin nearly as freely as the more road-friendly 105 Octalink crankset I had been using. Instead of going nuts with a White Industries VBC crankset, I tried the cheaper option of fixing what I already had. I’m happy to report that the FSA crankset now spins nicely and all is ready for the upcoming race.

Cyclocross Race: PACC No. 1, 2011

Saturday, April 23rd, 2011

I raced my first cyclocross race, and it turns out, the first cyclocross race held in Adelaide . The race was hosted by the Port Adelaide Cycling Club (PACC), and held in the Adelaide park lands just south of the CBD.

The early morning weather was cool and rainy, though my ride into the city was mostly dry. The weather was sunny and cool by race time, and the track was dry to slightly damp. I entered the ‘A grade’ with the elite roadies and such (I fall into the ‘and such’ category). The ‘A grade’ race was short at around 40-45 minutes. The lower ‘B grade’ only went for 25 minutes, and that seemed quite short.

Photo Credit: Jeremy Miller, Eternity Cycling

There were 25 racing in the ‘A grade’, and I started near the back. The race was fun, and felt much like the ‘dirt crits‘ that the AMTBC used to run in the summer. The Gunnar performed well, and the only change I’d consider making is either lowing the tyre pressures (currently 65/75psi F/R), or perhaps switching to something wider and taller than the 32/30mm Speedmax combo I’m using.

Anyway, I held out and was lapped by the top four finishers a couple hundred meters from the finish. I finished 14th out of 25, total time 43:32, and missed being on the lead lap by 14 seconds. Overall, I’m very happy with my result. The full results are posted on the PACC CX blog.

More photos and video:

Another Video… I believe there may have been more cameras than bicycles at the race.

adelaide cyclocross. from Sam Roberts on Vimeo.

AMTBC Cromer 6hr Enduro

Monday, April 4th, 2011

Last weekend I helped build some new singletrack for the AMTBC Cromer 6hr Enduro, and yesterday I raced it in the solo singlespeed class on the rigid Kona 29er.  The course was well-suited for a singlespeed, though only five of the 85+ entries were in the singlespeed class.  I used a 32×20 gear, while most of the others I talked to were on taller gears.  Most of the track would have been faster with taller gearing, and I think I could have gone with a 34×20 or a 32×18/19 without too much difficulty.  On the other hand, I was quite happy with the 32×20 gearing towards the end of the race.

I was much more careful with fluids, gels and food, and as a result, my lap times were much more consistent than on the Foxy 1000.  As far as the bike went, it had no mechanical issues; no flats, no dropped chains, nothing.  The Ignitor 29×2.1″ tyres were very grippy, predictable, fast, and I’m still very happy with them.  Also, I’m beginning to see some of the benefits of hydraulic brakes.  Even after six hours, braking with the Elixir CR Carbon brakes was easy and I had none of the fatigue that the old Paul’s rim brakes, and to a lesser extent the BB7s caused.

The rigid fork was great for the first four laps/3.4 hours–  the last three laps/2.9 hours were less than comfortable.  Most of the discomfort was in my fingers and arms, and it made some of the choppy/rocky sections in the last few laps a little difficult.  On the other hand, my wrists were fine.  Could this be due to the super-cork wrist-saving Ergon grips?

In the end, I completed seven ~13.5km laps, for a total of around 94.5km in 6:13:46.  I did manage a top-five finish, but as I previously mentioned, there were only five in my class.  Even so, I’m very happy with my lap times, and will be racing in more enduros this autumn/winter.

My lap times:

Lap1234567
Time00:44:0400:49:5700:54:2300:53:1600:58:5000:57:5900:55:18

Complete results: Cromer Race 1, April 3

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