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Questions tagged [transmission]

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6 votes
2 answers
2k views

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

The cables coming out of the twist grip for my Nuvinci N380 went "sproing" the other day and I pedalled home frantically in low gear. This isn't the first time this has happened. On closer ...
Robert Atkins's user avatar
5 votes
3 answers
698 views

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

For reasons that I have not yet understood, the smallest sprockets with only 11 teeth have prevailed in derailleur cassettes of road bikes, which leads to a very strong deflection of the individual ...
Dave's user avatar
  • 153
4 votes
5 answers
1k views

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

Restoring an old bike with smaller space between the dropouts and want to use it with a "modern" 9 speed XT derailleur. The shifting needs to be fluid so I'm trying to keep "9 speed&...
tweedi's user avatar
  • 587
3 votes
3 answers
631 views

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

I have a commuter bike using a 3x9 MTB transmission: HG61 9 speed 11-32T: 11 / 12 / 14 / 16 / 18 / 21 / 24 / 28 / 32 Deore XT crankset (104MM) 22 / 32 / 44. I mostly use the 32-tooth middle ...
tweedi's user avatar
  • 587
2 votes
2 answers
316 views

chain slack with 2x setups with large rear cassettes

I would like to upgrade the transmission of my bike and was thinking to a 2x setup (36/26) with a 9/46 rear cassette, with the latest SLX. There was some contradictory info the cassette manufacturer, ...
Rеnаud's user avatar
  • 20.6k
2 votes
2 answers
173 views

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

The bicycle I am thinking to buy has a stepless shifting hub that is officially rated for 75 NM typical and 90 NM maximal torque. The electric engine of the bike can provide 75 NM at the maximal ...
nightrider's user avatar
  • 7,879
1 vote
2 answers
88 views

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

Unfortunately broke a Shimano sm-sp25 cable router for 90s Marin. It seems the spacing between the two cable is 25mm. Online I only find sm-sp17 and sm-sp18. Can I buy one of those? or any other? ...
tweedi's user avatar
  • 587
1 vote
2 answers
46 views

Bike upgrade wheels shifters cassette

Hi everyone I have a boardman comp hybrid nine speed how easy is it to change it to a eleven speed for the extra four gears. From https://www.bikeradar.com/reviews/bikes/road-bikes/boardman-comp-...
jim cooper's user avatar
1 vote
2 answers
2k views

Hub motor is frozen!

I bought a 1500w motor & supposedly compatible controller from ebay. I put it together, and it worked good! I let it sit a few weeks. Hub is now FROZEN. it has ~2" of free roll then hard ...
Trass Vasston's user avatar
1 vote
1 answer
81 views

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

My kettwiesel 2006 trike is set up from the factory to use a shorter chain or a longer chain depending upon the riders height and is shipped that way from the factory. An option from the factory is a ...
Michael's user avatar
  • 71
0 votes
1 answer
273 views

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?

I have a Triban RC 100 women's road bike and I bent the stock cransket in a crash so I am looking to upgrade to something better. I was thinking of upgrading the cransket to a Shimano Sora but would ...
einstein dhayal's user avatar