Unanswered Questions

632 questions with no upvoted or accepted answers
7 votes
0 answers
97 views

What kind of kickstand mount is this?

Which kickstands fit this bike? The old kickstand had 6mm bolts spaced 18mm apart, so I bought a "KSA18" kickstand, but it didn't fit. The KSA18 stand extended further than 9mm and had a ...
7 votes
0 answers
177 views

Front wheel steering types

So far I've found two types of steering aside from the classic direct steering ( Handlebar->Stem->Fork->Wheel rotating in head tube bearings (headset)) that eliminate the head tube, used in a ...
7 votes
0 answers
354 views

Why did Shimano change their rear derailleur design going from a torsion spring to a tension spring inside the parallelogram?

The older Shimano rear derailleurs (pre 7700) use a torsion spring inside the parallelogram. But with the release of the 7700 group they switched to a tension spring which they continued using ever ...
7 votes
1 answer
195 views

Wheel centred in frame but dished 8mm to non drive side, why is this happening?

This is a 135mm OLD wheel mounted in a 130 mm frame. I removed spacers from the axle to make it 130mm. I then put the wheel in the frame and proceeded to dish. I made sure the distance between the rim ...
7 votes
1 answer
513 views

Campagnolo 12s with Shimano Cassette

I'm considering building up a bike with a Campagnolo 12 speed mechanical groupset with a Shimano cassette. I've been using Campagnolo 11 speed with a KMC chain and non-campy cassettes without any ...
6 votes
0 answers
659 views

Would like to identify a late 80s/early 90s lo-pro bicycle's manufacturer and tube type

I just purchased this bike locally in Southern California and thought it would be straightforward to identify but I've asked around and no one seems to know. The specs are: Lugged steel (fork crown ...
6 votes
1 answer
479 views

Alternative to 5-speed twist shifter for Shimano Nexus 5-speed IGH?

I'm going to buy a SG-C7000-5D / SG-C7050-5D and don't want to use the twist shifter. Unfortunately there aren't many 5-speed flat bar shifters around theses days. I've searched for alfine shifters, ...
5 votes
0 answers
58 views

Is it strong enough to braze stainless steel tubings with silver?

I was told that you could not braze stainless steel tubing with brass as you would with non-stainless ones. And you should use 56% silver instead? Isn't silver too weak to braze tubes together? I know ...
5 votes
0 answers
106 views

Nexus 7 Hub: Is it normal to have resistance when back pedaling?

I have a Nexus 7 speed hub with 19t cog and a triple chainring. Experiment: Using a rear derailleur to take up chain tension; the hub shifts fine in all gears and the the triple shifts fine. It all ...
5 votes
0 answers
291 views

Did this part come from my bicycle?

I was working on my bicycle, a 2021 Domane SL5, and laid it on the ground. When I picked it up, I saw a small metal ring on the ground underneath. I don’t know for certain if the metal piece came off ...
5 votes
0 answers
173 views

Swain Power-HR relation

I am trying to understand how to use Swain HR to Power equation in my case. Here is a calculator where one can vary the inputs and see the various outputs based based on the equation: http://www....
5 votes
0 answers
911 views

Help identifying MTB frame

Apologies making ANOTHER one of these threads...Anyhows: Bought a bike third hand, frame has been stripped and painted. Trying to find make & model so I can get some offset bushings for the shock. ...
5 votes
1 answer
765 views

Is a chin strap with a cup safer than an under-chin strap?

Many helmets have chin straps to hold them on. One design uses a split chin-strap, where the strap splits into two forming a cup shape, one going just below the lower lip and one under the chin. In ...
4 votes
0 answers
52 views

Shimano Dura-Ace R9120 lever leaking

My bike's Dura-Ace R9120 rear-brake/front derailleur shifter (left shifter in UK) leaks brake fluid when I pull hard on the lever. It leaks from this specific place: I understand this lever is ...
4 votes
0 answers
104 views

Shimano Roller Brake Model BR-IM31 (specifically!!)

New to the world of roller brakes (new cargo bike) and need to change back inner tube due to flat. I'm trying to work out how to remove the back wheel and have unclipped the gear cable (nexus hub) but ...

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