The wheel deal.

22 06 2016

Well, I thought I’d share this set of images.

This is the Bontrager Barbegazi, at 20psi, on a Nextie 65mm external rim – 27.5×4.5 (770mm diameter and 115mm casing width, a few more knob to knob).

That’s big.

Compare to a fairly normal 29×2.2 MTN King.

Now, it is next to a Bontrager Chupacabra 29×3 (765mm diameter iirc).

Perhaps most interesting…next to a 26×4.5 Flowbeist (somethign like 745mm diameter – I think! might be 750mm)

As predicted, the Vertigo cycles fatty is a hoot with a 29+ front/27.5+ rear. I actually think it might be bad for my health. Just today alone, I crashed 3 times. Not because I lost traction, more because I was tackling obstacles at a greater speed than I am used to. As a result, I was landing closer to stumps, trees and other immovable objects than I am used to. Sometimes, too close! Interesting.

My curiosity will get the better of me though – I will pull the rear Chronicle in order to mount a Hodag so the bike will be more balanced when I put that Barbegazi on the front.

Oddly, the tape I use (3M 764) failed the first time I mounted the Barbegazi. The tape is 50mm wide so I did one wrap and then dry mounted the tyre, as I usually do, before addign sealant. In this case, the bead seemed to grab the tape on both sides and drag it apart, tearing it down the middle. I re-did it with a little sealant to lube the bead’s passage up the rim into the bead socket and it was golden. Live and learn.





A different tack.

20 06 2016

A little while ago, I tried to do the Highland Trail Race. Tried and failed. I still have very mixed feelings about the whole thing. This year, with stellar weather, I enjoyed following the blue dots and admit to a pang of (for want of a better word) jealousy.

Let me explain: you cant really be that jealous of folk turning themselves inside out, over tough terrain, with precious little kit and big miles to cover in each ~14 hour+ day in the saddle. It is a tough race.

Anyway, as detailed in the old post linked above, I got to thinking after failing to even start the HTR 550, that I wanted to *enjoy* what I was doing on the bike. In other words, I was keen to try a route or two that did not invite too much hardship in terms of daily miles or trail conditions. So, recently I decided to try an ‘easy’ bikepacking route.

I would jump on the train in Glasgow, head to Perth, alight and cycle off into the evening along the easy cycle route up to Dunkeld and from there, head west to Amulree and take the gravel road up Glen Quaich, popping out at Kenmore, where I planned to enjoy some food at the Kenmore hotel.

My plans after that were fluid: I would find a spot to bivi and make my way back down to Glasgow.

I had not done a lot of research and I was under the impression that Glen Quaich had a dirt road, rather than a gravel/partly sealed road. No matter. Despite being on my fat bike, it all went well and the sun shone as I spun along the idyllic pass from near the geographical centre of Scotland, past Loch Freuchie, towards the mighty Tay.

After a fine meal in the Kenmore Hotel, the evening was still young, so I pedaled off west, beside Loch Tay, and had a pint in Killin where the fine views of the Falls of Dochart were somewhat spoiled by the incessant midge.

My plan was to bivi somewhere on the route over to Glen Ogle, in the pine forest northwest of Lochearnhead. I eventually found a reasonable spot, and unrolled my Mountain Laurel Designs FKT (Fastest Known Time) bivi – a recent purchase – for it’s inaugural use. Because of the material selection, this bivi is extremely light, has an essential-for-Scotland midge net and packs very small. As a result, I had opted for the size large, to give me plenty of wriggling room, as I am a restless sleeper.

I had a great nights sleep, although waking to a cloud of midge in front of the netting was off putting and I had a fair amount of condensation inside the bag. This happens with bivi sacks. In the fading light, I had failed to notice that the ground was not just grass as I had thought, but was a mix of sphagnum moss. This holds collosal amounts of moisture and the cool, breezeless night, heavy dew and low cloud meant condensation was a given. In terms of volume and comfort, this bag and I are going to be friends! at less than half the weight of my old Rab bivi, the drop in encumbrance is welcome too.

Dancing around in the morning to avoid the worst of the breakfast club of midge, I got rolling and slowly the cloud level rose and as I left Lochearnhead, to head into Glen Ample for a bit of old school Scottish mtb action, I was able to strip off some layers.

From here, it was a quick descent to Callander, with the now obligatory 2 bacon rolls at ‘Taste of the Trossachs’ before climbing over to Aberfolye and then on to Garadbhan and the WHW back to base.

Reflections:

It was quite an easy route – somewhere in the vicinity of 50 miles each day and it was nice to have a solid destination planned for food in the evening. The fat bike was fine despite the reasonably high road percentage. It was slower than a normal mtb would have been, but that was kind of the point. I also learned that my knees and hips were fine with the wide bb over this sort of distance. Good to know.

In retrospect, I wish I had given myself a bit more to do. I was enjoying the riding in the warm sunshine and it seemed over a little too soon. I also would have liked to have been a little more remote – bikepacking is a great way to get stuck in to the best terrain in Scotland without having to do mega miles or use complicated arrangements of transport and being ‘away’ from it all is a big draw for me.

So: I have learned several things – it’s all good.





Differential.

12 06 2016

I’ve been messing around with different sized wheels on the Jones for a while now. It has settled on a 27.5×3.8 (nearer 3.5 in reality) front and a 27.×2.8 rear. I like how a slightly bigger front wheel gives good roll over and a smaller rear seems to stay ‘tucked in’ and agile in the tight stuff.

My Vertigo Cycles fat bike has now got a new set of wheels as well. The front is a 29×3 and the rear is a 27.5×3.

The front wheel I have had for a while, shod with a Chupacabra; the rear with a 27.5 Chronicle complements it very well.

The build was as follows: Nextie Junglefox 2, with Sapim D light spokes, DT aluminium nipples and a DT swiss big ride 197 hub.

I followed the advice of Wheel Fanatyk and used beeswax to lube the nipple/rim interface. It worked very well indeed. The nipples are pro lock.

Tensioning was a bit of a mixed bag, it wasn’t quite as smooth as I had hoped and there is more than 10% variation on a couple of the spokes. Perhaps this was because I went with 2 cross due to the extreme bracing angle of the super wide hub and the stiff carbon rim. It seemed to tension very late and suddenly.

In retrospect, I might have gone 3 cross as this would lessen the angle of the nipple at the rim.

That or perhaps I should have used the pro head DT nipples, that are more spherical shaped and thus sit at extreme angles more easily.

I have a couple of hours on it. It seems to be fast, the rear doesn’t particularly feel smaller than the front in terms of roll over, but the bike as a whole is very manoeuvrable. The front is kicked back a touch and feels to have slightly light steering input. It gained a cm in height with the bigger radius over the Flowbeist.

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This wheel change is temporary to further evaluate the mixed wheel size: in time it will be mounted with a 3.8 Hodag rear and 4.5 Barbegazi front, which should be less of a differential.





Base building.

8 06 2016

The time I might spend driving to a new or more interesting destination is sometimes better spent rolling miles from the door.

So it was as I headed out along the West Highland Way, yet again, on another sunny day.

The walkers were starting to gather to amble the long, meandering route to Fort William and it led to some polite hellos before I turned at Garadbhan to take the sealed (ish) road towards Aberfoyle and then through Queen Elizabeth forest, but instead of the usual ‘mangrunt‘ extension to Inversnaid, I climbed, skirting rainclouds and goats at Comer, around the back of Ben Lomond.

The view to the Arrochar Alps and the Cobbler was amazing – too much for my meagre camera skills and the decent down to Loch Lomond side was as steep as I remembered.

It is always a pleasure to ride the techy trail on the edge of this bonny loch and so it was that day.

Returning via the cycle path from Milton of Buchanan to Drymen then rejoining the WHW to head for home. I worked out the mileage and knew the time accrued, but I have forgotten. Money in the bank/miles in the legs and yet another dry-trail ride.

Next up, a bikepacking trip of a relaxed nature, using a new, superlight bivi.

I also have a load of bits and bobs to do – including an inspection of a 9point8 Fall Line dropper post, which is to be used on a new bike build soon, some wheel building action involving beeswax and a 27.5+ Chronicle and 27.5+ Ikon. More soon.