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Unanswered Questions

357 questions with no upvoted or accepted answers
16
votes
0answers
93 views

The chemistry of mixing sealants

It's become a fairly common occurrence in shops to be faced with a tubeless wheel that was doing fine, slowly started having issues, and hasn't had a sealant re-up in a while or ever, but what sealant ...
12
votes
0answers
141 views

Bicycle w/locking steering column?

Pulled this bike out of an old shed on a property we just purchased. Believe it to be an aluminum frame but was more intrigued with the locking steering column. The badge is not on it; can anyone tell ...
8
votes
0answers
185 views

Please help identify my 1940's (?) Tandem Bicycle

Please help me identify this tandem bicycle. Here's what I know: I'm pretty sure it's not a Schwinn, as all Schwinn bikes had straight frames without curves. From what I can tell, Hawthorne used ...
5
votes
1answer
120 views

Help Identifying Italian track frame

Hi I would like to know the maker of this bike I brought back from my stay in Italy. It has been repainted, It isn't the original fork, and the serial located on the top of th bb is :1148591 Any clue ?...
5
votes
0answers
103 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
1answer
458 views

Cylinder volume of hydraulic brakes and levers

I've been asking around for a while now but even workshop pros couldn't answer this (by citing exact figures): How big are the brake cylinders of disk and rim brakes in terms of volume and surface ...
4
votes
2answers
940 views

Is it safe to use aluminium seatpost adapter (27.2mm to 31.6mm) for a carbon frame?

I have Cane Creek Thudbuster Seastpost (aluminium) 27.2mm x 400mm which i want to use for a bike with a carbon frame (31.6mm seat-tube). I'm thinking about getting a seatpost adapter/shim from 27.2mm ...
3
votes
0answers
33 views

Non standard hub bearing?

I need to replace a hub bearing. On it, I can Read ZPL (manufacturer I guess) and 6200RS. 6200 seems to be a standard for (inner diameter x outer diameter x width) 10 x 30 x 9mm. But when I measure, I ...
3
votes
0answers
129 views

Please Help me identify my Bike Logo

Hello can someone help me identify my bike Frame?. It has this weird Logo and a Serial number of : "2948" . It has Suntour Dropouts likely NJS. Thanks!
3
votes
1answer
70 views

Dynamo cutting out after a couple of seconds

This sounds like I've an electrical issue, but no idea of next steps. I have a Gazelle Tour Populair with what I believe is a Busch & Müller LYT Lumotec Retro front dynamo-powered light. When ...
3
votes
1answer
264 views

Sora R3000 STI shifters compatibility

Are the new Sora R3000 STI shifters compatible with dura ace 7700 brakes and derailleurs? Thanks
3
votes
0answers
53 views

Pannier Bags for Burley Kazoo

I have a burley kazoo trail-a-bike, which my five year-old and I are really enjoying. When not trailing my 5yo, I can easily put my Arkel pack onto the burley rack, but its attachment points don't ...
3
votes
0answers
151 views

Measuring fork steerer diameter

I've acquired a Raleigh Suntour (circa 1990s) frame which I am re-fitting. I need to refit the headset and so I need to know the dimensions of the steerer column. The frame had an threaded stem. I've ...
3
votes
0answers
114 views

Ackermann compensation - how to work Peter Eland's spreadsheets

I am building tadpoles trike with "dual crossed drag link" type steering, and having been using the spreadsheets below to get the Ackermann compensation right. I am however not really sure how to get ...
3
votes
0answers
285 views

Help identify this loop frame bike

I'm trying to find out more information about this old loop frame bike I'm planning to refurbish. I haven't found any other marks that may be identifying, if there's anything else I can take a photo ...

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