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Posts Tagged ‘AMTBC’

Video: AMTBC “Eagle Short Course” MTB Race

Tuesday, December 22nd, 2009

The ‘Eagle Short Course’ race was the second race in the 2009/2010 AMTBC Summer Series, and my second MTB race.  This race was similar in format to the ‘Dirt Crit‘ in that the course was short (about two minutes per lap), but the terrain was a little more technical.  The race was time limited plus two finishing laps, with the riders separated into five race grades.

Based on my performance and observations in the first race, this time I decided to enter in the ‘C Grade’.

My race stated well.  I was in second after the mass start, and held that position for two or so laps.  I passed the leader and actually held the lead for about a lap, and then crashed one one of the slightly technical sections (around 2:30 in the video).

I had ridden this section of the course several time prior to the race, but this time I didn’t quite make it.  My front wheel grabbed a rut in the dirt and I went over the bars.  Surprisingly, the front wheel came partially out of the dropout and the brake jammed.  After a quick repair and wheel realignment I was back in the race, though apparently about 30 seconds down (on a sub two-minute lap).  The rest of the race was unevetful with a few passes and being passed a few time.  I ended up finishing seventh of ten.  The complete C Grade results here:

Race Plate132323849345451415421454453423
Finish12345678910
Laps16161616161515131310
Lap 100:01:5500:01:5800:01:5600:01:5700:01:5700:02:0000:01:5500:02:0300:02:0100:01:58
Lap 200:01:5200:01:5400:01:5300:01:5500:01:5300:01:5800:01:5200:02:1600:02:0200:01:51
Lap 300:01:5600:01:5300:01:5500:01:5500:01:5500:02:0100:01:5400:02:1900:02:0900:01:54
Lap 400:01:5500:01:5500:01:5500:01:5500:01:5400:02:0600:02:2500:02:2700:02:1700:01:53
Lap 500:01:5300:01:5400:01:5400:01:5600:01:5400:02:0200:02:0500:02:3300:02:1900:01:52
Lap 600:01:5700:01:5600:01:5700:01:5800:01:5700:02:0600:02:0500:02:3100:02:2500:01:57
Lap 700:01:5500:01:5700:01:5600:01:5900:01:5700:02:0300:02:0500:02:2500:02:3200:01:55
Lap 800:01:5000:01:5400:01:5400:01:5900:02:0000:02:0600:02:0600:02:3000:02:3000:01:52
Lap 900:01:5400:01:5300:01:5600:02:0100:02:0200:02:0400:02:1000:02:2600:02:3300:01:54
Lap 1000:01:5100:01:5600:01:5600:01:5600:02:0000:02:0700:02:0800:02:3100:02:3500:01:55
Lap 1100:01:5100:01:5400:01:5400:01:5300:02:0500:02:0500:02:0500:02:2100:02:37
Lap 1200:01:5500:01:5500:01:5500:01:5700:02:0600:02:0400:02:0700:02:1600:02:39
Lap 1300:01:5600:01:5900:01:5900:02:0400:02:0700:02:0700:02:0700:02:1300:02:36
Lap 1400:01:5500:01:5800:01:5800:02:0200:02:0400:02:0400:02:08
Lap 1500:01:5300:01:5400:01:5400:02:0000:01:5800:02:0400:02:00
Lap 1600:01:4800:01:4000:01:5600:02:0500:02:00
 
Avg. Lap00:01:5400:01:5400:01:5500:01:5800:01:5900:02:0400:02:0500:02:2200:02:2400:01:54
Total00:30:1600:30:3000:30:4600:31:3100:31:4800:30:5600:31:1200:30:5000:31:1400:19:01

I was race plate 421.  As you can see, the first few laps went pretty well, then in lap 4 I crashed.  My remaining lap times never quite recovered to my pre-crash lap times.

For comparison, average lap times by grade; minutes:seconds (number of laps completed):

A Avg. LapB Avg. LapC Avg. LapD Avg. LapE Avg. LapOverall Avg. Lap
2:12 (19)2:14 (15)2:19 (14)
2:28 (10)2:33 (9)2:21 (12)

Full results and more info available on the Adelaide MTB Club site: www.amtbc.com.

Like many others, I’m going to lay blame from my problems, at least partially, on my equipment.  I decided to swap my front Larsen TT tire with a 2.1″ Maxxis Rendez eXCeption series.  Supposedly, this tire should offer more cornering grip than the Larsen TT, and it may, but what it doesn’t offer is any braking traction whatsoever.  The Rendez was sketchy on any slightly loose descent, and felt disconnected in heavy sprints/acceleration.  Interestingly, this 2.1″ Rendez is actually 1/4″ narrower than the 2.0″ Larsen TT.  I rode the Rendez on a few trails prior to the race, and against my better judgment, I left it on.  For those who are interested, I generally ride the rear Larsen TT at 32 psi and the Rendez in front at 28 psi, both with tubes.

Overall I am happy with the results, and I’ll have more video and data tables after the next race.  The video turned out much better this time (no leaf on lens).  The first-person on-bike video was from the ATC3K helmet camera and the Sony W300 was used for the rest of the video.  Next time I think I’ll try for more off-bike angles

Video: AMTBC Dirt Crit 1 MTB Race

Sunday, December 6th, 2009

On Thursday I entered my first MTB race. This race was the 2009/2010 AMTBC Summer Series ‘Dirt Crit’ No. 1.  A ‘dirt crit’ is similar to a regular road crit or criterium in that the course is very short, but it differs in that the course is mostly dirt, hence ‘dirt crit’.  The race format sets a fixed amount of racing time for each race grade plus one finishing lap after the allotted time has elapsed.

This being my first race, I wasn’t quite sure which class/grade to enter. The grade system for this race was A through E, A being fast/elite and E being something like slow/recreational.  The E grade raced 15 minutes plus one lap, and each successive grade added five minutes; the A grade raced 35 minutes plus one lap.

I entered in the B grade.  My logic was that C must be average, and like everyone else, I think I’m above average.  As I checked in and realized who was racing and what grade they were in, I began to question my self-assigned grade.  But, it occurred to me that the worst that could happen was a last place finish.  And, as luck would have it, that is exactly where I finished.

My official results; minutes:seconds:

Lap 1Lap 2Lap 3Lap 4Lap 5Lap 6Lap 7Lap 8Lap 9Lap 10Lap 11Lap 12Lap 13Lap 14Total TimeAverage Lap Time
2:052:132:152:142:182:272:232:192:262:272:252:202:242:2332:392:20

For comparison, grade average lap times; minutes:seconds (number of laps completed):

A Avg. LapB Avg. LapC Avg. LapD Avg. LapE Avg. LapOverall Avg. Lap
2:12 (19)2:14 (15)2:19 (14)
2:28 (10)2:33 (9)2:21 (12)

Full results and more info available on the Adelaide MTB Club site: www.amtbc.com.

My average lap time was 2:20, which was only one second slower than the next fastest rider, but I was behind the cutoff and finished one lap down.  Comparing my average lap time to those in the C grade, it looks like I could expect to finsih somewhere in the middle grade.  This being the case, I think I’ll spend some time in the C grade and see how things work out.  But, we will have to wait for the next dirt crit in January to see what happens.

Until then, a photo of a camera Velcro’d to a helmet (if ‘Googled’ is a word, then so is ‘Velcro’d’):

Helmet, Camera, Velcro

…and a koala from Eagle Park:

Koala at Eagel Park

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