1×10 32too small? User input pleas
I realise gearing has been covered many times, and trust me, I’ve read all the posts! I have recently switched From SS to 1×10 with 36 upfront and find this fine in the peaks etc. however, it is a fairly light weight Xcode hard tail. I am currently building a hardcore hardtail, in 650B with heavier rubber etc and have been offered a 32t chainring. My concern is I will spin out in 32×11 too often? On the road, fine I don’t care, but what about getting enough speed to clear a big double or similar?Posted 4 years ago
It also depends on peddling style, I am aware, however, as I have recently switched I am still mashing (comfortably) a fair bit, so as I use gears more I will probably adopt a more spinning style. The concern r.e. Top speed is still there however.. Thanks in advance 🙂theotherjonvSubscriber
for a burst of speed to clear a double I’m assuming you could be revving at 120rpm quite easily, probably much faster than that.
120 rpm x 32/11 x pi x 0.7 (conservative on wheel dia with big rubber on) would give you 767m/min = nearly 30 mph.
How big is this double?Posted 4 years agotheotherjonvSubscriber
While waiting for the coffee pot, i just calculated
Assuming 120rpm approach speed, and a 45deg take off angle, and a landing ramp at exactly the same height as the take off one (ie. on a flat piece of ground). And no losses due to suspension / air resistance, etc.
The time of flight would be about 1.8s, and your horizontal vector would be about 9m/s, so you’d be able to clear a double about 16m across.
Coffee’s brewed now…..Posted 4 years agomunrobikerMember
I’m pretty fit (or at least was) and run a 32 and have done for the last 4 years. It suits me perfectly- I ride reasonably quick but spin and like riding big mountains. I ride mostly in the peak and never really suffer on the downs, I’ve got some good KOMs. I have run this set up on everything from my old giant anthem xc race bike to my big 160mm bikes.Posted 4 years agoglasgowdanMember
No idea why folk think a 32t ring is too small… see the above calcs for what speed you’re spinning out at! I don’t think I’ve ever truly spun out on 32-11, but then my riding doesn’t consist of fire roads. If I did spin out on a fireroad I’d happily freewheel for a few seconds until the long fireroad hill flattens out!
I guess when pedalling at obstacles I’m usually somewhere on the middle of the cassette with the 32T ring.
In short, 32T is FINE!
From http://www.machars.net/bikecalc.htm , at 95rpm in 32-11 you’re doing 25mph. That’s enough to clear any jump I know (maybe not the ft bill tables, but you could up the rpm on approach to those!)Posted 4 years agoBrownMember
As above: 32 is fine. I’m using all of the sprockets on an 11-36 cassette on a regular basis, but that’s what they’re there for. Climbing in the Peak, Lakes and Northumberland (up for 40k days out) has been fine.
I do spin out occasionally however. It’s not a problem at all in day-to-day riding (my other bike’s a singlespeed, so it happens all the time), but I’ll put a 34-tooth ring back on the front for racing (enduro stuff).Posted 4 years agovincienupSubscriber
34T 11-36 on 26er HT here and love it. Didn’t like 36T last year on FS, but I was in poor shape after months off bike so not that surprising.
I bet someone’s worked out a rule of thumb for how many teeth difference there are on drive rings between the given wheel sizes… here’s some sums though.
((32/11)x26) = 75.6 gear inches and ((32/11)x27.5) = 80 gear inches.
((36/11)x26) = 85 gear inches and ((34/11)x26) = 80 gear inches.
So, 32t and 11t smallest on your new 650b looks like it should produce about the same speed for effort as a 34t vs 11t on a 26er.Posted 4 years ago
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