Tech

Bike Check: Kevin Benkenstein’s Curve Karoo Prototype

By Bike Hub Features · 33 comments

We followed the dots at the inaugural Rhino Run, and after seven days the race between Abdullah Zeinab and Kevin Benkenstein came down to the wire. Abdullah finished the brutal 2,741 km course across South Africa and remote Namibia in 7 days 20 hours and 4 minutes. Kevin finished just 17 minutes later. 

Ultra-endurance racing is a novelty to us, so we asked Kevin a bunch of questions to get an idea of what goes into completing a race like this. We also took a closer look at the setup of his Curve Karoo prototype.

RhinoRunDSC08229-Focus.jpgImage by Rae Trew-Browne

How do you charge your devices? 

I use a Dynamo hub, which creates electricity as you ride. In the day this allows you to charge devices, a portable charger and cell phone in my case, and at night it powers a dedicated front light. I did use wall plugs once or twice but more for convenience than necessity.

Do you carry clean bibs? 

No. I wore one set (Privateer ONE bibs) the whole way. I did wash them at the last sleep stop with 470km to go, they were fine still but I stank and needed some extra morale

Do you stop to shower? 

I showered whenever one was available. I used to think not showering was hardcore or something but jeez it makes you feel better. I probably showered every 2nd day on average, it just makes you feel so much more human.

Where do you sleep? 

There were loads of towns, so I booked a room whenever I could. I would phone ahead when I left the previous town. Sometimes that would mean being let in by a security guard at midnight, but all the accommodations were very helpful. It wastes a bit of time getting checked in and so on but 3 hours in a bed has to be better than 3 hours on the roadside in a sleeping bag! When I did sleep out it was just in the sleeping bag alongside the road.

RhinoRunDSC08287-Focus.jpg

RhinoRunDSC08399-Focus.jpg

RhinoRunDSC08162-Focus.jpgRiders have to contend with extreme temperature variations making equipment and clothing choices critical. Images by Rae Trew-Browne

How much does what you carry weigh?

Excluding food and water, it is about 7 to 8kg. I carried too much warm stuff and the sleeping bag could have been a lightweight bivvy bag instead. At max, you can add 2kg of food and 12 litres of water to that. So the maximum bike and ‘stuff’ weight was 25-27kg, I guess.

What keeps you coming back?

I really really like racing people perceived to be better than me. I am also quite driven to improve as a racer and you can only do that if you compete and push yourself outside of what is comfortable.

What was the best choice you made with regard to setup?

No individual item really, but I think riding a setup I was used to and comfortable on was a good call as I felt super confident in my equipment, which is important I think.

If you could go back and do it again, is there anything you would do differently on your setup?

I would just take fewer clothing items, but that’s really weather related which is hard to gauge perfectly before the race.

What did you carry with you?

Bags / Storage:

  • Apidura Expedition Saddle pack 
  • Apidura Top tube bag 
  • Apidura Feed Bag x 2
  • Apidura Frame Bag
  • Bottles – Enough for 4L
  • Apidura Hydration Vest (2l)
  • Collapsible bottles x 5 (2,5l)
  • Voile Straps x 4

IMG_4096.jpgKevin carried 4 litres in bottles on the bike, plus a 2 litre hydration vest and five collapsible bottles containing an additional 2.5 litres. It’s hard to fathom carrying that much weight.

IMG_4097.jpg Kevin used a dynamo hub to charge a portable charger and cell phone, and a dedicated front light at night

IMG_4100.jpg

Clothing:

  • Cycling Jersey
  • Bib Shorts
  • Socks x 2
  • Sunglasses with Transition lenses
  • Mesh Spring Gilet
  • Spring Gloves
  • Perfetto short sleeve 
  • Gore Shakedry jacket 
  • Merino Base layer
  • Arm Warmers
  • Leg Warmers 
  • Winter Gloves
  • Buff x 2 
  • Cycling Cap

Tools and Spares:

  • Multi tool – with chain breaker
  • Tyre levers (x2) 
  • Hand Pump 
  • Lube x 2 (Dry)
  • Valve core remover 
  • Quick link x 2
  • Head stem bolts
  • Seat clamp bolt 
  • Spare valve stem 
  • Gorilla tape (Wrapped around seatp post)
  • Spare cleat
  • Spare cleat bolts 
  • Tyre boot
  • Tube
  • Hanger
  • Plug kit

Lights / Visibility & Other Electrical:

  • Garmin 1040 Solar GPS
  • Garmin inReach Tracker
  • Garmin Charge Power Pack
  • Portable Charger (10,000MaH)
  • Helmet Light + 5 Spare Batteries
  • K-Lite Light, USB converter and switch plugged into a SON Dynamo Hub
  • Garmin UT800 Front Light
  • Rear light x 2
  • Reflective Ankle Straps
  • Reflective body straps
  • Mains USB charger
  • Cable – USB – iPhone 
  • Cable – USB – Garmin
  • Cable – USB – Light / Battery Pack
  • Axs Charger
  • Axs Battery x 4

IMG_4101.jpgA Quarq powermeter keeps track of the watts being laid down

IMG_4102.jpgKevin used a SON Dynamo front hub to charge devices

Basic Survival:

  • Space blanket
  • Sleeping Bag

Miscellaneous:

  • Credit card
  • Cash
  • Mobile phone
  • Route Cues x 2
  • Passport

image.jpeg

Bike Specifications
  • Frame: CURVE Karoo Prototype
  • Stem: Easton EA50
  • Saddle: Specialized Power
  • BB: Wheels MFG T47
  • Hubs: Rear – DT Swiss 350; Front – SON Dynamo
  • Fork: ENVE All Mountain Rigid
  • Handlebar: CURVE Walmer Bar – 500/650
  • Shifters: SRAM Force AXS
  • Rear Derailleur: SRAM XX1 AXS
  • Cassette: SRAM XO1 10-52
  • Rims: CURVE Dirt Hoops 29 – 25mm Internal
  • Headset: Cane Creek
  • Seatpost: RaceFace Carbon
  • Brakeset: SRAM Red Post Mount
  • Crankset: SRAM XX1 Quarq – 36T
  • Chain: SRAM XO1 Eagle
  • Tyres: MAXXIS Rekon Race 29 x 2.4

IMG_4109.jpgKevin opted for “vet tekkies” with 2.4″ Maxxis Rekon Race on 29″ CURVE Dirt Hoops.

Keen to find out more?

If you have any questions for Kevin please drop them in the comments below, he’s kindly agreed to answer them.

 

 

Comments

Titleist

Nov 15, 2022, 6:35 AM

How do you get your buttocks "trained" for these type of rides?

splat

Nov 15, 2022, 7:35 AM

58 minutes ago, Titleist said:

How do you get your buttocks "trained" for these type of rides?

Bake it in vinegar

dave303e

Nov 15, 2022, 7:48 AM

interesting to see AXS in the mix for such a long race.

117

Nov 15, 2022, 7:52 AM

3 minutes ago, dave303e said:

interesting to see AXS in the mix for such a long race.

with 4 batteries...I'd hazard a guess he only changed it once though

You'd be surprised how bullet proof the axs systems are

dave303e

Nov 15, 2022, 8:05 AM

10 minutes ago, 117 said:

with 4 batteries...I'd hazard a guess he only changed it once though

You'd be surprised how bullet proof the axs systems are

My new bike has AXS, I do a lot of adventure racing, with around 500km of relatively unsupported mtb due at world champs next year I have been doing the math around carrying extra batteries vs popping regular derailleur on. At this stage I am also thinking of carrying spares...

Benky

Nov 15, 2022, 8:13 AM

1 hour ago, Titleist said:

How do you get your buttocks "trained" for these type of rides?

I’m not sure you can, but a good saddle and set of bibs definitely helps. I don’t struggle with saddle sores but chafe is always a challenge, so regularly apply Ass Magic and Vaseline to keep that under control. 

Benky

Nov 15, 2022, 8:15 AM

25 minutes ago, dave303e said:

interesting to see AXS in the mix for such a long race.

I’ve used AXS for racing exclusively since 2019 without an issue. I felt it keeps my hands in better shape because shifting is easier and more importantly the shifting is precise all through the race. I have found AXS to be extremely reliable too, moreso than mechanical on these dusty races. 

Benky

Nov 15, 2022, 8:17 AM

22 minutes ago, 117 said:

with 4 batteries...I'd hazard a guess he only changed it once though

You'd be surprised how bullet proof the axs systems are

I changed batteries pretty much every 20hrs on average, although I didn’t run them to 100% empty.
 

On Munga I get about 26hrs/battery but hillier terrain works them harder because you shift more. 

Matt

Nov 15, 2022, 8:41 AM

@Benky The race for 1st and 2nd was very close at the end for Rhino Run.

How much do you (or can you) pay attention to what others are doing in an event like this? And does that impact your strategy as things progress? Or is it a matter of putting your head down and doing your own thing?

Benky

Nov 15, 2022, 8:52 AM

7 minutes ago, Matt said:

@Benky The race for 1st and 2nd was very close at the end for Rhino Run.

How much do you (or can you) pay attention to what others are doing in an event like this? And does that impact your strategy as things progress? Or is it a matter of putting your head down and doing your own thing?

We were fairly close to each other most of the race so I had an idea because we would see each other. Other than that I would check when I got to towns, on the tracker, because that was the only time I would have signal. In those last 100km I was mostly clueless though, and half asleep, so I didn't really know until I saw him...but with that said I thought he would be catching me because I was as good as asleep on the bike by that stage. 

So you do try be aware but you don't want to be too focused on it otherwise you will risk blowing yourself up or ruining your pacing I think.

Fred van Vlaanderen

Nov 15, 2022, 9:02 AM

8 minutes ago, Benky said:

We were fairly close to each other most of the race so I had an idea because we would see each other. Other than that I would check when I got to towns, on the tracker, because that was the only time I would have signal. In those last 100km I was mostly clueless though, and half asleep, so I didn't really know until I saw him...but with that said I thought he would be catching me because I was as good as asleep on the bike by that stage. 

So you do try be aware but you don't want to be too focused on it otherwise you will risk blowing yourself up or ruining your pacing I think.

Well done @Benky on an amazing effort!! 

Curious as to what the recovery process looks like after an event like this. How did your body transition back to a normal sleep routine?

DJuice

Nov 15, 2022, 9:09 AM

5 minutes ago, Fred van Vlaanderen said:

Well done @Benky on an amazing effort!! 

Curious as to what the recovery process looks like after an event like this. How did your body transition back to a normal sleep routine?

@Benky are you starting Munga?

Personally will take probably 10 years to recover from that effort.

Respect, kudo`s on great ride!!

NGM

Nov 15, 2022, 9:27 AM

21 minutes ago, Fred van Vlaanderen said:

Well done @Benky on an amazing effort!! 

Curious as to what the recovery process looks like after an event like this. How did your body transition back to a normal sleep routine?

I'd typed the same question, almost word-for-word.

Maybe the answer is just "Yeah I slept a lot" but I would love to hear what the first week after the race was like.

Benky

Nov 15, 2022, 9:30 AM

6 minutes ago, DJuice said:

@Benky are you starting Munga?

Personally will take probably 10 years to recover from that effort.

Respect, kudo`s on great ride!!

@Fred van Vlaanderensleep is a ongoing process, but these last few nights it as been better and I think recovery wise I am on the up now. That first week or so was a mess though, long but very light sleep.

No Munga for me, I don't have it in my legs or head right now to be honest.

Benky

Nov 15, 2022, 9:41 AM

13 minutes ago, NickGM said:

I'd typed the same question, almost word-for-word.

Maybe the answer is just "Yeah I slept a lot" but I would love to hear what the first week after the race was like.

One thing I’ve realised is that it really messes with your hormone system and there is a lot of toxic stuff floating around my body. I had a lot of night sweat for two weeks but that’s going now, thankfully. I think hormone balance gets totally messed up. 

Shebeen

Nov 15, 2022, 9:58 AM

16 minutes ago, Benky said:

One thing I’ve realised is that it really messes with your hormone system and there is a lot of toxic stuff floating around my body. I had a lot of night sweat for two weeks but that’s going now, thankfully. I think hormone balance gets totally messed up. 

ah, the night sweats! that means you emptied the tank properly out there (incase it was in doubt)

Matt

Nov 15, 2022, 10:04 AM

@Benky thanks for all the answers already, but they breed more questions.... 😇

There must be a lot of lonely time "in your own head" while turning the pedals on these sorts of events. 

Do you solve the worlds problems out there? Or have mental tools and tricks to stay focussed and awake? Or just to keep going?

binxc

Nov 15, 2022, 10:06 AM

No questions for Kevin but I would like to say thank you for always being so open and happy to share information. It is very helpful for those of us who are considering it or starting out in these types of events. 

Benky

Nov 15, 2022, 10:25 AM

13 minutes ago, binxc said:

No questions for Kevin but I would like to say thank you for always being so open and happy to share information. It is very helpful for those of us who are considering it or starting out in these types of events. 

It’s my pleasure. I’ve been given a lot of support over the years so returning that with some help and advice is the least I can do. 

Benky

Nov 15, 2022, 10:30 AM

21 minutes ago, Matt said:

@Benky thanks for all the answers already, but they breed more questions.... 😇

There must be a lot of lonely time "in your own head" while turning the pedals on these sorts of events. 

Do you solve the worlds problems out there? Or have mental tools and tricks to stay focussed and awake? Or just to keep going?

@Mattit is a pleasure. 
 

You are right it’s a lot of alone time. I think racing makes it easier because you have to focus and so a lot of time and thought is taken up just by thinking about what you’re doing and need to be doing and just the general act of racing. Nights alone are hard though and it’s tougher to keep focus there. 
 

My main trick to keep busy, strangely, is to do a bit of maths. I work out average speed and expected eta in my head a lot, it’s also helpful to keep aware of how my mind is working. That’s a legacy of being a school boy with a computer that couldn’t show average speed on the first screen. 
 

I don’t listen to music or anything which is a bit different to others but I still get songs stuck in my head somehow. 
 

No world problems were solved. It was nice not to think about that stuff for a week actually!

milky4130

Nov 15, 2022, 10:55 AM

Well Done Benky, where do you think you lost it, lack of extra power due to the injury in the lead up to the Rhino Run?

Not sure what the road conditions were for the last +- 200kms but did Abdullah have an advantage with his gravel tires vs your 2.4's?

From the videos & photos it seemed like AZ was carrying less load on his bike, was there ever a thought or chance that you could lessen the load knowing you only have +-100kms to go? Is that even allowed? Sure you have to cater for every scenario but I'm just thinking what if that was the difference?

Shebeen

Nov 15, 2022, 11:03 AM

2 hours ago, Benky said:

I’ve used AXS for racing exclusively since 2019 without an issue. I felt it keeps my hands in better shape because shifting is easier and more importantly the shifting is precise all through the race. I have found AXS to be extremely reliable too, moreso than mechanical on these dusty races. 

why four batteries, this is just for the RD, right?

so two batteries is already a level of redundancy with one charging, or did you leave the charger at home even though i see it on the list?

 

black3qnobatteryl_1800x1800.jpg?v=1604913785

Benky

Nov 15, 2022, 11:31 AM

26 minutes ago, Shebeen said:

why four batteries, this is just for the RD, right?

so two batteries is already a level of redundancy with one charging, or did you leave the charger at home even though i see it on the list?

 

black3qnobatteryl_1800x1800.jpg?v=1604913785

Honestly it's just cause I would rather not charge if I don't have to, just simpler to swop a battery and they weigh almost nothing.

I did take the charger as a back up and used it twice, when sleeping and charging was easy. Effectively I used 7 batteries through the course of the race.

MORNE

Nov 15, 2022, 11:59 AM

@Benky 

is that a mtb fork on your bike?

im assuming the geometry of that prototype was adjusted for the extra axle to crown measurement?

So you could techinvcally run a 100mm fork on there if you wanted? well it looks like it from the pictures.  I'm guessing the extra stack height it gives you helps with comfort too.

Add a comment

You must log in to comment