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7 votes

Alternative gear ratio newbie question: Am I doing a mistake for this commuter?

Even with your current setup, you could be spending more time in the middle of the cassette and dealing with less total drivetrain wear by using the 44 more. So part of the answer is going to deal ...
Nathan Knutson's user avatar
6 votes

Is this a common failure mode for Nuvinci/Enviolo hubs? How do I fix it?

The cable tension should keep it flat & clipped in. I would first look at the orientation you are installing the gear cable and make sure it seems like physics is on your side. I would also check ...
Noise's user avatar
  • 14.6k
5 votes

Making a 7 spd cassette or freewheel out of a 9 spd (need to save space to fit in dropouts!)

If you buy a Shimano cassette, they are generally riveted and to free them you need to drill or grind the heads of the rivets off. SRAM and SunRace cassettes have a single long bolt you can unscrew or ...
Noise's user avatar
  • 14.6k
5 votes

Making a 7 spd cassette or freewheel out of a 9 spd (need to save space to fit in dropouts!)

If it's the 9 speed XT derailleur you want to use, it can work perfectly in an otherwise 7 speed drivetrain since Shimano derailleurs from 6 thru 9 speed mountain (and 10 speed road) all share the ...
Jeff's user avatar
  • 11k
4 votes

Alternative gear ratio newbie question: Am I doing a mistake for this commuter?

I would suggest keeping the 32t middle chainring (replacing if worn) and using an 11-28 9-speed cassette to get the result you seek. The chainring should have ramps to work with the other 22 and 44 ...
Ted Hohl's user avatar
  • 6,437
4 votes
Accepted

Improving the Efficiency of a Derailleur: Enlarging the Cassette Sprockets to reduce Friction

Back in the 9s and 10s eras, my recollection (which could be mistaken) is that cassettes starting with 12t were common, although gearing was 53/39. Professionals used cassettes starting with 11t. A 53/...
Weiwen Ng's user avatar
  • 33.9k
3 votes

Broke old cable bottom bracket cable router and can't find like for like, can I buy another?

Any will do, it doesn't have to be made by shimano. I suggest you liberate one from a scrap bike rather than buy new.
Noise's user avatar
  • 14.6k
3 votes

Improving the Efficiency of a Derailleur: Enlarging the Cassette Sprockets to reduce Friction

Commercial cassettes are available starting from 13 or 14 teeth. However, for any given system, particularly road groups, the largest sprocket/lowest gear is limited by the derailleur design as well ...
Noise's user avatar
  • 14.6k
3 votes

Alternative gear ratio newbie question: Am I doing a mistake for this commuter?

You seem to be relying heavily upon 32t. Why not just keep 11-28 and go 1x with 36t? I had this exact setup for a year in a flat city like yours, and was very comfortable with close ratios and ...
Barış Atasoy's user avatar
3 votes
Accepted

Hub motor is frozen!

If I had this bike, I'd contemplate selling it (or the kit) as a $1 no-reserve auction. It is going to be a continuous stream of problems, and you're heading for the sunk-cost fallacy. In the short ...
Criggie's user avatar
  • 128k
3 votes
Accepted

chain slack with 2x setups with large rear cassettes

So I asked them, and their reply was it is not recommended, as it would imply to have a very long chain Well, it doesn't really require a very long chain. It would require a long chain if you were to ...
leftaroundabout's user avatar
2 votes

Making a 7 spd cassette or freewheel out of a 9 spd (need to save space to fit in dropouts!)

Assuming your frame has an 130mm OLD spacing because it was 7 speed originally - it may be reasonable to "stretch" the frame. This requires a steel frame if your bike has aluminium or ...
Criggie's user avatar
  • 128k
2 votes

Making a 7 spd cassette or freewheel out of a 9 spd (need to save space to fit in dropouts!)

I don't know about 9 speed, but you might be able to make this work using 10 speed parts. Some (all?) 10 speed Shimano cassettes come with the the top 3 sprockets as one unit and then 7 loose ...
Andy P's user avatar
  • 18.3k
2 votes

chain slack with 2x setups with large rear cassettes

It is true that if riding on bumpy ground in the gear combination with the most slack, a clutch derailleur has a smaller probability of dropping the chain from chainrings or having the chain hit the ...
juhist's user avatar
  • 20.1k
2 votes
Accepted

Is the stepless shifting hub that is rated for 75/90 NM torque inadequate for the 75 NM engine?

Torque at the hub is reduced by the gear ratio. Take an example: a 55t ring with 22t sprocket gives a 0.4 torque multiplier. this translates the 90Nm motor torque to 36Nm at the hub. Not much problem! ...
Noise's user avatar
  • 14.6k
2 votes

Improving the Efficiency of a Derailleur: Enlarging the Cassette Sprockets to reduce Friction

It should be possible to construct a cassette with a bigger smallest sprocket from off the shelf parts. Although it may require buying multiple cassettes to cannibalise pieces to construct your ...
Andy P's user avatar
  • 18.3k
2 votes

Broke old cable bottom bracket cable router and can't find like for like, can I buy another?

A search on eBay yielded a few SM-SP25 cable guides for sale. Typically found at vintage bike parts stores on eBay. They are a bit pricey it seems, perhaps owing to it's all-metal construction. The ...
Jeff's user avatar
  • 11k
2 votes

Bike upgrade wheels shifters cassette

If you need a different range of gears (eg, an easier low gear), you don't need to add more gears, you can just get a different cassette and probably a new chain. If you really want more gears, you'll ...
Adam Rice's user avatar
  • 30.3k
2 votes

I Have a Triban RC 100 (Small, Women's bike) I am upgrading the cransket to a Shimano 105, do I need to upgrade the entire transmission too?

Looking at a couple of iterations of your Triban RC 100. This version seems to have MicroShift components, where as in this RoadCC review of the Triban RC 100, the bike sports a Shimano 7 speed thumb ...
Jeff's user avatar
  • 11k
1 vote

Can I use a chain gobbler on my kettwiesel trike to accommodate shorter and taller Riders as I move the boom in and out?

A "chain gobbler" is a recumbent device that takes up slack in a chain. A regular bike derailleur gear system can do this with the cage in the rear derailleur, and they may have a capacity ...
Criggie's user avatar
  • 128k
1 vote

Bike upgrade wheels shifters cassette

According to the specs - this bike is from 2007 and as sold had a 10 speed Tiagra chain and "a 105 rear derailleur designed for 10 speed systems" So, going to 10 from 9 needs a new cassette, ...
Criggie's user avatar
  • 128k
1 vote

Making a 7 spd cassette or freewheel out of a 9 spd (need to save space to fit in dropouts!)

You don't remove 2 cogs. You remove 1 cog. That's called "8 of 9 on 7". 9-speed cogs are thinner. If you take seven 9-speed cogs, you have a far thinner cassette than a typical 7-speed ...
juhist's user avatar
  • 20.1k
1 vote

Is the stepless shifting hub that is rated for 75/90 NM torque inadequate for the 75 NM engine?

Me, only 15 NM? I am not sure. I am sure about my torque. If I stand on the forwardmost pedal, it's 110 kg weight. If I pull up from the rear pedal with 25 kg weight (clipless pedals) and push down ...
juhist's user avatar
  • 20.1k

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