On the last few rides I noticed a click, a metallic click that only happened when I was out of the saddle. So, out on the road, I made sure that the cable ends where not clicking or catching on my shoes, they weren’t.
The noise sounded like it was from the rear of the bike. Don’t let this fool you though, bike noises can travel through the frame and be somewhere else completely.
I knew however, the likely cause was the chainring bolts, as I’d recently replaced the chainrings.
So, tightening this bolt up to the recommended torque of 7nm, and noise stopped.
However if you don’t know what is causing the noise, just work methodically, push and pull things like your cranks, ensure bolts are done up to torque, and greased, check for play in bearings. Spin cranks backwards while looking for jumps in the rear derailleur, You’ll find it eventually.
In my last post, I said how I was wanting to try oval chain rings. Well, due to good fortune, I’ve come by some.
So, I stripped down the chainrings, threw out the knackered shimano bolts, and installed the new rings, with a helping of anti seize paste on both parts of the bolt. Just watch out for this stuff, a tiny spot on the fingers, and your finding spots of it all over for months. It’s really tenacious stuff.
Fitting them onto the bike, it’s noticeable just how odd they appear. They where easy to install however. I hadn’t changed the gearing, sticking with the same 50/34 the bikes always had. Installation meant I had to move the front derailleur up, to account for the greater height of the large ring. The official installations have instructions to fanny about with the limit screws. I didn’t have to touch those. I raised the derailleur, ensured the cage was parallel with the ring and then set the cable tension, ensuring the gaps were correct.
Testing the shifting, it was absolutely fine, didn’t drop or over shift, and each change happened as expected.
The first few rides, I never really felt any difference in the pedals, but a few rides, I started to notice a couple of things. Firstly, I was riding higher in the cassette (smaller cogs) because my cadence had shot up, to get my favoured RPM, I’d had to start using gears well up the cassette. This meant that I’ve also started to use the larger chainring a lot more than I ever have.
“Our Oval chainrings work because a rider does not produce power evenly through a pedal stroke; they maximize the part of the stroke where power is produced and minimize resistance where it isn’t. Oval rings make the spin cycle a lot smoother and are easier on legs while climbing. Believe it (or not), but a round chainring doesn’t transfer torque to your rear wheel as smoothly as an Oval one. You will actually feel your stroke to be more “round” with an Oval shape than with a round chainring.”
Secondly, I was rotating the cranks easier, and for longer. I found it a lot easier to just keep going. Coasting was down and out. This may be down to the fact it feels smoother, less forced as that “Dead Zone” is overcome with the oval.
You can see in the graph above, cadence is constant, speed and power are levelling out. It just seems easier to keep going. When sprinting, the power just seems more urgent, and direct.
Don’t get me wrong, these chainrings are not going to change you into Bradley Wiggins overnight, but they do, clearly make a difference, to me at least. I’d recommend, if you need to change worn chainrings, give them a try and see if they are for you. One of the drawbacks, I’ve noticed a few people looking, and noticing this weird wobbling thing. 😏
Unfortunately, I have had a string of issues with the bike, which means its off road until parts arrive.
Recently, I replaced the chain and cassette, but on subsequent rides, the noise from the chainrings was a steady grind and occasional clank as the chain struggled to mount the teeth. It appears the inner chain ring is worn off the old chain. Strangly, its almost two years to the day I last replaced it. Now, removing the chainbolts, two sheared off when placing back into the crank. So not only have I to replace the worn chainring, I now have to source 4 crank bolts. Ah well.
I had been looking at getting Absolute Black chain rings, but money is very tight at the moment, so I’ll stick with the standard Shimano internal ring. ChainReaction where wanting about £20 for a ring, but as I was looking round, bike-discount.de was offering them at about €8. So that was a no brainer. The crank bolts however, are stupid expensive. EBay was the cheapest I could find, at about £25 for the 4.
As the Ultegra crankset is no longer produced, and I have no desire to install the new 8000 series, and its dérailleur, I might just go with the Absolute Black once the outer chainring wear becomes an issue.