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tips on finalising road bike conversion

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tips on finalising road bike conversion

Old 03-05-17, 03:12 PM
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flik9999
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tips on finalising road bike conversion

Hey so I converted my sirrus specialised to a roadie.

However what iv noticed is when riding on the horns I am sitting right on the edge of the seat.

Should I get a super short stem (50mm) or look into a more forward seatpost?
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Old 03-05-17, 03:30 PM
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nfmisso
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your choice.
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Old 03-05-17, 03:32 PM
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dabac
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My vote goes to short stem.
Moving the saddle forward will move your hips forward WRT the BB.
Which makes it harder to brace your upper body against the pedalling action.
Which may shift more weight onto your arms.
Which you may not like.
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Old 03-05-17, 03:42 PM
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You have discovered one the the problems when converting an MTB flat bar bike to drops. MTB frames have long top tubes since the reach to the bars isn't as long as for drop bars. The best work around is indeed a short stem.
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Old 03-05-17, 05:15 PM
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flik9999
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Anyone done this sort of conversion before? How does a super short stem feel to ride?
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Old 03-05-17, 05:17 PM
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Would this sort of stem fit my bike? I have flat bars with dropbar ends swan off as apposed to the usual fit a drop bar on the bike.

WAKE STEM CNC ANODISED MTB 31.8MM 50MM RED GOLD BLUE GREEN BLACK DH XC | eBay
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Old 03-05-17, 05:35 PM
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well known that the rider generally has better power/endurance combo with the seat a bit farther back, unless you are doing the superman.
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Old 03-06-17, 12:37 AM
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Originally Posted by flik9999 View Post
Anyone done this sort of conversion before? How does a super short stem feel to ride?
Kinda-sorta. I have limited flexibility in my lower back, which has pushed me to shorter and shorter stems on all my bikes.
It looks a bit funny but rides just fine.
No two bikes ride exactly the same anyway.
I adapt to - and forget about - the different feel within a minute of riding.
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Old 03-06-17, 08:58 AM
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You don't want to make fore/aft adjustments by moving the saddle because it'll affect the position of your saddle relative to your crankset. In general, I subscribe to the notion of positioning the saddle relative to the crankset and then positioning the handlebar in relation to the saddle. That way, you can adjust saddle-to-crankset and saddle-to-handlebar relationships independently of one another to get both dialed in precisely how you want them.
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Old 03-06-17, 10:50 AM
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Another thing I am currently using grip shifters on the end of my bars for shifting.

I found these downtube shifters which are clip on. Now they definatly wont fit on my downtube but do you think I could get them onto my stem? They are 28.6 mm, does that sound about right for a modern stem?



NOS Shimano Downtube Shifters 6 SPEED Road Bike Gear 28.6mm RD-TY20 CABLING | eBay
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Old 03-06-17, 12:14 PM
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Originally Posted by flik9999 View Post
Another thing I am currently using grip shifters on the end of my bars for shifting.

I found these downtube shifters which are clip on. Now they definatly wont fit on my downtube but do you think I could get them onto my stem? They are 28.6 mm, does that sound about right for a modern stem?
Modern stems really don't have an outside diameter like quill stems since a threadless stem clamps around the steerer tube. The steerer tube would be the member with an outside diameter, but it's normally entirely covered by the stem and spacers, so you really don't have a surface to clamp shifters onto. (Well, unless you leave a lot of uncut steerer tube exposed above the top of the stem and remove spacers above the stem after installing the stem ...but you probably don't have enough steerer tube to do that.)

I don't think you've mentioned details on your bike other than the model name and that you've converted it to a drop bar. What year is your Sirrus? Or, better yet, can you tell us whether the stem is threaded or threadless, and how many gears do you have? And where do you want your shifters mounted -- brifters, bar ends, stem, downtube, etc.?
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Old 03-06-17, 01:06 PM
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I have a 45 mm stem on my bike friday ..with trekking bars* .. Low Trail , it loves a front load.


* with the rear bend straight across, it's zero reach .... they're in line with the steering mast ..





...

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Old 03-06-17, 01:12 PM
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Originally Posted by flik9999 View Post
. . . do you think I could get them onto my stem? They are 28.6 mm, does that sound about right for a modern stem? . . .
Do you really prefer anonymous wild guesses over a simple first-hand measurement?
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Old 03-06-17, 02:41 PM
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The Sirrus was basically a flat bar road bike (not a mtb). I converted my 2002 Sirrus to drops. I used a Salsa 25 deg. x 110mm stem & Salsa Bell Lap bars. Tektro long pull levers with the original V-brakes. For shifters, Microshift bar ends index great with the original 105 rear and I love the manual trim on the front triple. 35mm tires fit with A23 rims and make it a decent gravel bike although a bit stiff riding.
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Old 03-07-17, 10:24 AM
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flik9999
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Originally Posted by SkyDog75 View Post
Modern stems really don't have an outside diameter like quill stems since a threadless stem clamps around the steerer tube. The steerer tube would be the member with an outside diameter, but it's normally entirely covered by the stem and spacers, so you really don't have a surface to clamp shifters onto. (Well, unless you leave a lot of uncut steerer tube exposed above the top of the stem and remove spacers above the stem after installing the stem ...but you probably don't have enough steerer tube to do that.)

I don't think you've mentioned details on your bike other than the model name and that you've converted it to a drop bar. What year is your Sirrus? Or, better yet, can you tell us whether the stem is threaded or threadless, and how many gears do you have? And where do you want your shifters mounted -- brifters, bar ends, stem, downtube, etc.?
Hey I have no idea what the model of the bike is, I currently have a 6 spd rear cassette with an 8 speed index shifter. I got this bike off a mate hence why I have converted to road bike as hybrid not really my style.

It has a threadless stem.
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