Showing posts with label magnets. Show all posts
Showing posts with label magnets. Show all posts

Tuesday, 3 February 2015

White Witches, Wrenching & Other Intrigue











The Genesis Croix de fer 2.0 has certainly cast a playful, engaging and dependable spell upon me. 180 mixed terrain miles and counting.  There’s no space for another machine and in any case, simple, squeezed economics preclude such indulgence. However, swooping through the S bends or enjoying its punchy climbing prowess conjures thoughts of building a frameset along similar lines.

I’m thinking rear facing track ends, two sets of bottle bosses, disc mounts and spacing for Alfine/similar hub transmission. This would give the option of running it fixed (packing the hub with spacers), single speed freewheel, or geared.

Cyclo cross bikes were a well-kept secret for countless years, until renewed interest in the discipline saw larger names cotton on, producing “civilian” ranges with wider gearing, mudguard/carrier eyelets, several sets of bottle bosses and similar refinements.

In many respects, the Croix de fer is a prime example of this species. Said Chimera is to cross what road path was to track-capable in competition, yet faithful weekday donkeys that will tour equally convincingly. Steel blades have been largely eclipsed in sporting terms by carbon/composites but remain extremely practical and arguably better suited to this design brief.

Short in the torso, I’m finding reach a little stretched-not painfully so and steering could never be described as barge like. Nonetheless, I’m going to see what difference a 9cm extension makes.

The past 140 miles have coincided with seasonally appropriate temperatures and challenges; though there’s been no hint of going “rubber up” due in part to the super supple 35mm Continental cyclo cross speed tyres. Designed for hard/dry courses, they’ve been surprisingly competent in soggy, churned bridle path and through leafy forest trails.

Proof that dual purpose isn’t synonymous with woefully lacking, they roll quickly over tarmac at 80psi and contribute to the “magic carpet” ride quality. I’d consider a set of these for the Ilpompino but being an earlier incarnation, its rear triangle shuts the door to anything bigger than 32mm with mudguards. 

Conversely, the Croix de fer will entertain 38mm spiked snow/ice rubber with breathing space, though playing it safe, I’d err on something 35mm like Kenda’s Klondike skinny.

Sticking with tyres in a broader context and reverting to the 90s when I lived in the capital, I found myself bitten by the “frankenbike” hybrid concept. This involved dressing an older/new old stock, upper mid-range Cro-moly XC mtb frameset in a hotchpotch of aesthetically agreeable goodies that made it stop, go and handle in decent proportion.

44/46cm Drop bars were easily acquired-cheap as chips too but patterns were decidedly conservative and a bit whippy when pushed hard.  Given  ‘Cross racing’s such a short season on these shores, many riders entered on MTBs, which were welcomed, or at least superficially most people seemed live n’ let live about things. 

Hutchinson even produced a 26x1.4 ‘cross specific model for this market. Capable, it was also decidedly niche and priced accordingly. Prior to their discovery, I also had surprisingly good results in dry to moderate conditions with WTB 26x1.5 All Terrainasaurus (£6pr NOS back in 2001).

The Univega is an extension of this concept and originally conceived for long and short haul rough stuff touring. Having upgraded its computer, subsequent test runs confirmed the head unit’s location was incompatible.

Further bin diving couldn’t retrieve a compatible bar mount, so I modified the stem-fit using Sugru putty impregnated with a powerful button magnet.  This tethers securely to the stem’s preload bolt and is effortlessly removed when performing headset strips/servicing or just locking up in the street.             

Coinciding with a bar wrap group test at Seven Day Cyclist www.sevendaycyclist.co.uk, its tainted, though extremely agreeable Lizard Skins DSP (Dura Soft Polymer) tape has been superseded by Cinelli “Chubby Ribbon”.

Claimed 30% thicker than traditional corks, there’s plenty of it, although greater density meant several revisions before pleasing, uniform effect was achieved. By contrast, this equally fetching M-part tape (M-part is Madison cycles in house brand) breezed aboard in fifteen minutes flat.

Fashioned from leather look polyurethane, its reckoned to deliver in all weathers, thus “particularly suited to daily commuters and winter bikes”. Initial impressions suggest so but in common with a few other titles, we test things for at least several weeks and a good few hundred miles before arriving at any firm, conclusive opinion. Let’s see what another 300 miles through wet, cold and fairly mucky February roads reveal….

Finally, let’s talk torque wrenches. Like track pumps, they’re not essential in the literal sense-most of us will snug something tight, guess tyre pressure when recovering from a roadside flat (though most of us carry Co2 cartridges and/or some form of gauge too). Emergencies aside, incorrect assembly tension has the very real potential to threaten life and limb via ruin components, frames and voids warrantees.  

Thankfully as prices for space age materials tumble, consumer tooling follows suit. £50 buys something like this M-Part, which comes complete with protective carry case and compliment of popular bits. Regardless of type; these are very sensitive to everyday wear n’ tear, let alone abuse, so should always be stored in their protective cases at the lowest settings.

“Click” models such as this are the most common variety. These employ a factory calibrated clutch mechanism with a pivoted head indicating when desired pressure has been achieved.  
STOP AT THE FIRST CLICK, beyond this places additional strain on the component/fastener, enticing fatigue and the risk of tool destruction (though you’d be forgiven for thinking otherwise, watching some automotive fitters!!).

A consistent, mechanically sensitive technique is equally imperative. Components such as four bolt stem faces demand following a diagonal pattern to prevent stress points or stripped threads. You did introduce that lick of grease/bonding agent….