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captaingrumpy SCOTT-Sports's article
May 16, 2019 at 17:28
2 days
Video: Kate Courtney Delves Into the Roots of her MTB Career in Episode 1 of 'Rising'
Back in the mid 90s Tam was already off limits to non equestrians. There were some really angry folks out hunting violators. I’m glad she grew up being able to ride but I don’t remember any of those nice trails being legal. Is it possible that parent mtb money made progress against the equestrian money?
captaingrumpy jamessmurthwaite's article
May 16, 2019 at 7:11
3 days
Pinkbike Primer: Albstadt World Cup XC 2019
Never tasted redbull but sure appreciate their coverage. Are there ads i can watch to help them monetize? I love the womens racing, seems to be lots more exciting than the mens. Is that dumb kiwi still racing? The angry one? He was pretty strong. Fun to root against.
captaingrumpy jamessmurthwaite's article
May 14, 2019 at 5:33
May 14, 2019
Video: Rob Warner Tries to Keep Up With Emily Batty in Arizona
I wish we lived in a world where that lifestyle could be earned by riding an mtb fast.
captaingrumpy Milko3D's article
May 13, 2019 at 8:16
May 13, 2019
A Himalayan Mountain Bike Adventure
Can you talk a bit about keeping your tires alive? What tires did you use and what repairs were needed? What would you do different next time?
captaingrumpy mikekazimer's article
May 7, 2019 at 19:07
May 7, 2019
First Look: DT Swiss' New Ratchet EXP Hub Design
@takeiteasyridehard: right! Ok I eyeballed the fall distance before the weights flew off. 3 bikes and 3 weights and I’m getting drag of about 0.4-0.5 watts for front, 0.7-0.8 for the back. That’s at really low speed though. At high speed the drag increases but will be dominated by the knobby air drag. Anyway. I’m feeling this shows that hub Bearing drag is small potatoes.
captaingrumpy mikekazimer's article
May 4, 2019 at 13:40
May 4, 2019
First Look: DT Swiss' New Ratchet EXP Hub Design
@labourde: I work on my truck. It’s bearings are designed by adults. Engineered. I have huge respect for the products engineered by skf and timkin. They last and last when applied properly. No problem repacking 35 year old wheel bearings that are big as marbles. Generally the sealed bearings used by bikes have a single seal and a single seal can’t stop water from sucking grease across the seal boundary. Underwater seals exist, there’s never a grease to water interface, always an air gap. I don’t think commercial bearing quality is to blame, it’s the misapplication that lets them fail. Skf makes a bottom bracket, it’s got double seals with air gap and the spindle is machined as a race so they can use larger balls. The thing lasts forever. Probably even as long as the old Shimano cartridge bottom brackets. I suspect an skf hub would last forever too. I don’t think anyone can reasonably claim that king makes better bearings than a huge bearing company, so must be how it’s exposed to the elements. I suspect they last so long because the seals can be reinstalled after cleaning and regreasing. Also the play can be adjusted out. But I’m still stumped about how they last so long in practice. Is pretty amazing to me. I have two friends that wore out their dt bearings, one a 350, the other a 240. Took almost 3 years but they developed play. Had to replace the bearings and it wasn’t cheap. I think was 60 for the bearings and then had to pay a bike shop to do the free hub for the press. The dt bearings we’re not rotted like my hopes, but they’d worn to have play.
captaingrumpy mikekazimer's article
May 3, 2019 at 23:05
May 3, 2019
First Look: DT Swiss' New Ratchet EXP Hub Design
Jesse man. You know the tire and rim weight, you can figure the rotational inertia. Turn bike over, use a small weight on tire and let it fall to start wheel spinning. Count rotations and time. The energy in is what that weight imparted as it fell. You’ll be able to work out drag pretty easily. Force over distance over time? And guess what? The number is small. Do front and back wheel and compare the difference, that’s the cost of freehub.
captaingrumpy mikekazimer's article
May 3, 2019 at 22:15
May 3, 2019
First Look: DT Swiss' New Ratchet EXP Hub Design
@oldschool43: Thanks for the considered reply. The 400 hours is lots of climbing, more like 3000 miles. I never submerge bearings but everything gets splashed. Never ever pressure wash. I also corroded out several bottom brackets: some generic thing and then a wheels mfg unit. Also corroded away a cane creek 40 headset. The balls rust and there was no grease left. Now I have a king bb and a cane creek hellbender headset and they’ve both lasted well. Ive disassembled all sorts of bearings, usually when trying in vain to regrease them. The kings are unique in two ways that I can see: the seal is a thin gasket behind a steel snap ring. Their seal doesn’t look nearly as good as a normal (skf) bearing seal, but it does have the advantage of being removable and reinstallable. I can clean the balls out and regrease and it’d be like new. But after 2 years I removed a seal and found the inside looked exactly like it did when I greased it when I got it. There were water drops on the grease. I used blue electric motor grease. Maybe their seals work? I dunno. The hubs last for sure. The second delta is that the king bearings are made of hard stainless. It might be 440c. The stuff doesn’t rust and neither to the balls. I’m not exaggerating my rear hub has now seen 15 years of single speeding and is still on its original bearings. I’d get sick to my stomach to pay retail for a king hub but I think they’re a great value used.
captaingrumpy mikekazimer's article
May 3, 2019 at 8:05
May 3, 2019
First Look: Garmin's New Edge 530 and 830 Cycling Computers
@f00bar: https://www.singletracks.com/blog/mtb-gear/gps-accuracy-gps-vs-smartphone-vs-cyclocomputer/ Newer article. Similarly flawed as theyre round tripping through strava and linear interpolating between points. What i see is that the raw data from the latest iphones (specifically the 6s and later) are simply better than the cyclecomputers. Interesting is that speed info from gps is more accurate than location, so is often best to bias location using speed. I consider the strava round trip a huge benefit for common trails, they can average thousands of traces to pretty closly approximate the truth, then snap a rider onto the path. Maybe the last 20 traces ive investigated, 100% have been from cyclecomputer gps just going haywire. I strongly suspect garmin specifically has childishly broken interpolation that is corrupting the data i see.
captaingrumpy mikekazimer's article
May 3, 2019 at 6:19
May 3, 2019
First Look: DT Swiss' New Ratchet EXP Hub Design
@Lorieng: Pacific northwest. I do ride in the wet, sometimes the trail is a stream, but water is clear, i avoid mud. The bearings rotted to brown nuggets - they arent stainless and the seals didnt hold in the grease. The king hub was ridden many thousands of miles in its first 12 years, now its survived three full winters with me. I cleaned it last fall and it was slightly dirty. I was a skeptic but the king is delivering for me. I've had many cheap hubs last longer than the hope.
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