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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 10-17-07, 09:51 AM   #1
dauphin
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Flat bar to drop bar conversion underway

There have been various threads and posts over the past couple of years about converting a flat bar bike to drop bars, so here goes my experiment with this process.

Not long ago I had to sell my Bianchi Giro and moved back to riding my Sirrus hybrid with the flat bar setup. The Sirrus came stock with 8 speed cassette, rapid fire shifters, 48/38/28 crankset, aluminum frame, cro-moly fork, linear pull brakes, and 28mm tires. It just so happens I still really enjoy this bike but would prefer the drop bar set up that I've become accustomed to. As luck would have it, I managed to salvage some very good parts from a bike that belonged to another family member. That bike had had a nasty accident. I ended up with a 105 50/30/39 crankset, a 105 front derailler, and a set of drop bars with the 10 speed 105 brifters.

I have installed the 105 crankset and it works pretty well with the existing 8 speed cassette, the Deore rear derailler and the nexave front derailler. It will be much better with the 10 speed cassette and 10 speed chain. I will probably add a 105 rear derailler to the upgrade so that all the components match.

The linear pull v brakes are going to require installation of little thing called a "travel agent" to make the brakes work with the new brake/shifter system. I managed to find them at bikemannetwork.com for a good price.

Before I get too far ahead, I'd like to thank Jerry in Lodi, who converted his 03 Sirrus to a touring set up for advice and ideas on this project. You can see what he did at http://www.touringonbikes.us/jerry's%20bike.htm

Here's what my bike looked like before any changes.


Here's a shot of the current rear derailler and 8 speed cassette.



The first thing I did was change the 28mm tires for a 23mm set that I had. You can also see the 105 crankset in this photo.



Here's a closer shot of the crankset.



I'll post some more photos when I get the bars/brifters and other parts installed. This is quite a learning process for someone like me who is really not very mechanical. Anyway, thanks for viewing!
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Old 10-18-07, 02:46 PM   #2
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ups just delivered the ten speed Shimano chain that I bought on Ebay. Still waiting on the 10 speed cassette to arrive. It should get here about the same time as the travel agents for the brakes.
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Old 10-18-07, 03:25 PM   #3
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Looking forward to seeing your results,
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Old 10-18-07, 11:50 PM   #4
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I'd be really curious about the final price tag too. Good luck!
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Old 10-18-07, 11:57 PM   #5
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that's the weird thing...the cranks..the front der., the handlebars, the brifters, all came off of a bike that was trashed due to a collision. Those cost me nothing. So far, I've spent 55.00 on a new 10 speed cassette, 15.00 on a new 10 speed chain, and 40.00 on the travel agents for the brake conversion. I still need a stem for the handlebars..so so far I'm in for 110.00 which is cheap considering I didn't have to buy all of the components.
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Old 10-19-07, 06:37 AM   #6
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very interesting build...im all about DIY style bikes!
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Old 10-23-07, 10:25 AM   #7
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Ok, so I have my new cassette and chain as well as the travel agents for the brakes....but I need some help with the stem. My other bike had a 110mm stem with a 10 degree rise. In looking at listings and ads for stems they sometimes give the degree of rise and sometimes they don't or perhaps they are describing it in different terms...Can anyone enlighten me on this?
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Old 10-23-07, 01:29 PM   #8
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There ya are.
Quiz the collective hive.That's what I do.

http://www.cyclingnews.com/tech/fix/?id=roadposition Scroll down just past midway.
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Old 10-23-07, 03:43 PM   #9
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There ya are.
Quiz the collective hive.That's what I do.

http://www.cyclingnews.com/tech/fix/?id=roadposition Scroll down just past midway.
that one makes sense....sorta
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Old 10-23-07, 04:25 PM   #10
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so, after all of that....I read this post..."just subtract from 90..." If the stem is listed at 84 that would give you a 6 degree rise. That assumes that most head tubes are around 72...(mine is 72.5) on the Specialized and was 73.5 on my last bike. Perhaps I should go for less than a 10 degree rise on the new stem.
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Old 10-28-07, 11:48 PM   #11
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I am looking to do a similar conversion drop to mt 2005 Sirrus Comp. It has a double in the front and a 9 in the back. I have bars and a stem that I hope works. I am now looking for shifters (9 speed). And if I understand you correctly, you are keeping the stock brakes but adding a part called a travel agent? Are you changing your brake cables and shifter cables as well? I really appreciate the info and the links. I want to see how I like the position of a drop road bike before I go purchase a new one.
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Old 10-29-07, 12:47 AM   #12
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well, I am sure I dont't have to change cables...just add the travel agents..which should be here this week... I will post pics...
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Old 10-29-07, 04:06 AM   #13
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well, I am sure I dont't have to change cables...just add the travel agents..which should be here this week... I will post pics...
I wouldn't bet on it. If your cable is frayed even a tiny bit you probably won't be able to get it to work with the Travel Agent. There may be a length issue too. I'd plan on new cables.
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Old 10-31-07, 02:39 PM   #14
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ok...since I am not altogether mechanical...I delivered my bike and the various parts to my lbs and the owner immediately suggested that I go with a wider bar so he did a swap with me and substitued a new stem and bars. He will be installing the new bars, new stem, new front derailleur, the new cassette, the new chain, running the shifter and brake cables, the travel agents for the v brakes, and of course the new bar tape. He's doing all of that for 40.00.

Here's what it looked like when I dropped it off today as well as a pic of the travel agent. I will hopefully have it back tomorrow, but Friday at the latest.















Hopefully I can post the new pics with all the conversions by Thursday or Friday.
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Old 11-02-07, 04:46 PM   #15
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ok, the bike is finished and here are the pics...











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Old 11-03-07, 02:07 PM   #16
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made a couple of minor adjustments...moved the seat forward a tiny bit and tilted the handlebars up just a bit to match the feel of my previous bike. Took it out for about a 20 mile ride and the set up feels really good.
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Old 11-03-07, 02:16 PM   #17
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Looks nice Dauphin. Enjoy the new ride.
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Old 11-03-07, 03:08 PM   #18
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Can't say as I like the cable routing. Will it go side-to-side full lock with stressing the cable housing?

Pictures are fine, but it would be nice to know the details. What stem? Did you (he) have to replace housings?
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Old 11-03-07, 03:11 PM   #19
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Nice conversion, sweet bike!

It's cool to see a contemporary Specialized Sirrus, especially in dropbar trim.

I have (what I was told) a late 80s/early 90s Sirrus being refurbished and updated. It was about to be trashed. This was a full road race spec bike, 105 7 spd SIS, Tange tubing. Not like the hybrid of today.
I can't find much data on these old Specialized bikes online. Plenty though on the celebrated Allez.
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Old 11-03-07, 04:00 PM   #20
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the stem is a Felt 6061 alloy 110mm 7 degree rise alloy. The bars are Felt 31.8 6061 alloy. The cable housings and cables are new and the routing is as it was before. The only addition was the travel agents that replaced the noodles that were there before.
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Old 11-03-07, 06:06 PM   #21
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Say, not bad at all.
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